Welcome to UK420

Register now to gain access to all of our features. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. You'll be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more!

This message will be removed once you have signed in.


Is Secondhand Marijuana Smoke Dangerous? Biologist Says Yes



Published on 19 Mar 2018


Is Secondhand Marijuana Smoke Dangerous? Biologist Says Yes




Share this post

Link to post



at least stoners will...:wassnnme:


Die A Happy Man By Thomas Rhett 




Share this post

Link to post

Despite no link to lung cancer?


Or is he worried about second hand psychosis?

2 people like this

Share this post

Link to post

Hi Absurdist

lol so true 

face facts and lets be real 2p...

he is a silly person think please, as a person would have to sit in the same room for years to catch anything most people only smell a passing smell for few seconds or minutes.

More Spooky Professors  

Bah humbug 


Bongme :yinyang:

Share this post

Link to post



Wee Add On



Second-hand marijuana smoke has the SAME effect on arteries as cigarettes - but it takes longer to recover from



Daily Mail


Marijuana smoke puts the same kind of strain on blood vessels that tobacco smoke does, research has revealed. 

Cannabis is now legal to use medicinally or recreationally in 29 states and two extracts from the plant have even been approved by the FDA to treat chemotherapy-related nausea. 

Its medicinal uses have given the drug a positive reputation in recent years, but smoke is still smoke, an expert from the University of California, San Francisco warns. 

Smoke from a joint - marijuana rolled in paper - has the same weakening short-term effects on blood vessels that cigarette smoke does, but last three times as long, research has revealed. 


Though it is still classified as a schedule I drug by the US Drug Enforcement Agency, marijuana has come a long way in the public eye since the days when it was called 'the devil's lettuce.' 

Much of the fear and stigma that long surrounded (and still does, in some places) marijuana has been tied to the psychoactive effects of its active component, THC. 

Research has yet to demonstrate clear benefits or harms of THC on the brain, but has, on the other hand, supplied evidence that the non-psychoactive cannabinoids in marijuana can ease anxiety, pain and nausea. 

But as the drug itself becomes more widely accepted, a widespread presumption that using it - in any form - is 'safe' has followed. 

Yet, in states where it is legal, most people are still rolling the buds from marijuana plants into joints, lighting up, and smoking them, at home or even in public, where others may be exposed to secondhand smoke. 



In California, where medicinal marijuana has been legal since 1996, more than half of all consumers use it by smoking the dried buds in papers, bongs or pipes. 

Doing so exposes them to some of the same negative health effects that smoking tobacco cigarettes would, according to recent research.  

Dr Matthew Springer and his team at the University of California, San Francisco, exposed lab rats to secondhand-levels of both tobacco and marijuana smoke. 

After one minute of exposure to either kind of smoke, the rats blood vessel function was impaired by about 50 percent. 


This effect is short-term, but experts suspect that repeated exposures lead to long-lasting damage and the poor cardiovascular health seen in cigarette smokers. 

However, the rats exposed to cigarette smoke recovered their blood vessel function within 30 minutes, while those that were around secondhand marijuana smoke were still suffering the effects 90 minutes later. 

It's unclear why the damage of one would last longer than the other, but 'they're both the result of burning dry plants,' says Dr Springer. 


'When you burn dry plants, you get thousands of chemicals that are very, very similar, whether it is smoke from wood, tobacco, or marijuana, and many of them are toxic,' he explains.  

Many people have the impression that nicotine is the harmful aspect of of cigarettes and that marijuana smoke is not dangerous because it does not contain nicotine, Dr Springer says. 

But that is not the case. 'Weed smoke has cannabis, tobacco has nicotine, but other than those we found all the same chemicals' in the smoke, he says. 

'Much of the harm is coming from these other compounds, and both kinds of smoke consist of fine particles getting inhaled into the lungs. 

'These fine particles are similar to air pollution and are thought to have cardiovascular effects all on their own,' says Dr Springer.  

These effects will be felt either from smoking yourself or from being exposed to secondhand smoke.  


He says that the misconception that the effects of smoking marijuana as opposed to tobacco are largely reputational. 

'A lot of people will say that marijuana is natural and they view tobacco as a concoction of chemicals from tobacco companies and marijuana as a pure plant,' he explains.  

There is some truth to that, as there are additives in cigarettes. But perhaps more importantly, while there have been sweeping public health campaigns against cigarettes, marijuana has been given a 'glow' because of its medicinal properties. 

There has been far less research on the health risks of marijuana smoke than there has on tobacco smoke, and 'people mistake the absence of evidence of harm for the evidence of absence of harm,' Dr Springer says. 


But his research, he hopes, will debunk that assumption. 

'The take-home lesson is that, even though we haven't proven that this has harmful effects in humans, we've proven that there is a harmful effect of tobacco that marijuana has too.

'That means you can no longer assume that marijuana is harmless,' Dr Springer says.   





Add Comment







Share this post

Link to post



Comments add on...


Top Hitter


KMD1991, Dublin, Ireland

Who cares? If you can't handle a bit of smoke in the air then get up & move away from someone who smokes, whatever it is they smoke. Problem solved. If you can handle it then you've nothing to worry about.


Share this post

Link to post


Who do these London Media work for us or the Gov?


All the negative article from London over the years the public have slapped it down every time, all of them! :yep:

When we get positive news the London media always hide it so much hardly anyone sees it, BUT if its Negative its front page news, am sorry about this London Folks just sick of the none stop against cannabis BS from the Media! 


I dont care if you like what i say or not am just sick off it! :soap:



Bongme :yinyang:

Share this post

Link to post

Some have been using this in Asia to justify there harsh drug laws 



Secondhand marijuana smoke poses risks, early science says

By: Marissa Ortega-Welch / KALW- @inquirerdotnet

California Healthline / INQUIRER.net US Bureau / 12:34 AM March 24, 2018

Scientists are finding that, just as with secondhand smoke from tobacco, inhaling secondhand smoke from marijuana can make it harder for arteries to expand to allow a healthy flow of blood. PINTEREST

The inspiration arrived in a haze at a Paul McCartney concert a few years ago in San Francisco.

“People in front of me started lighting up and then other people started lighting up,” said Matthew Springer, a biologist and professor in the division of cardiology at the University of California-San Francisco. “And for a few naive split seconds I was thinking to myself, ‘Hey, they can’t smoke in AT&T Park! I’m sure that’s not allowed.’ And then I realized that it was all marijuana.”

Recreational pot was not legal yet in the state, but that stopped no one. “Paul McCartney actually stopped between numbers and sniffed the air and said, ‘There’s something in the air — must be San Francisco!’” Springer recalled.


As the visible cloud of pot smoke took shape, so did Springer’s idea to study the effects of secondhand marijuana smoke.


Why is marijuana smoke OK with people?

He started thinking: San Franciscans would never tolerate those levels of cigarette smoke in a public place anymore. So why were they OK with pot smoke? Did people just assume that cannabis smoke isn’t harmful the way tobacco smoke is?

Springer was already researching the health effects of secondhand tobacco smoke on rats at his lab at UCSF. He decided to run the same tests using joints.

“By the time I left the concert, I was resolved to at least try to make this happen,” he said.UP

He knew it would be difficult. Marijuana is still an illegal drug under federal law, and Springer’s research uses federal funds; so he has to purchase specially approved government cannabis for study. He also can’t test it on humans; hence, the rats.

Lab test

In the lab, Springer puts a cigarette or a joint in a plexiglass box. Then he lights it and lets the chamber fill with smoke, where an anesthetized rat is exposed to the smoke.


So far, Springer and his colleagues have published research demonstrating that secondhand tobacco smoke makes it harder for the rats’ arteries to expand and allow a healthy flow of blood.

With tobacco products, this effect lasts about 30 minutes, and then the arteries recover their normal function. But if it happens over and over, the arterial walls can become permanently damaged, and that damage can cause blood clots, heart attack or stroke.

Springer demonstrated that, at least in rats, the same physiological effect occurs after inhaling secondhand smoke from marijuana. And, the arteries take 90 minutes to recover compared with the 30 minutes with cigarette smoke.

Springer’s discovery about the effect on blood vessels describes just one harmful impact for nonsmokers who are exposed to marijuana. Statewide sampling surveys of cannabis products sold in marijuana dispensaries have shown that the items may contain dangerous bacteria or mold, or residue from pesticides and solvents.

California law

California law requires testing for these contaminants, and those regulations are being initiated in three phases over the course of 2018. Because much of the marijuana being sold now was harvested in 2017, consumers will have to wait until early 2019 before they can purchase products that have been fully tested according to state standards.

“People think cannabis is fine because it’s ‘natural,’” Springer said. “I hear this a lot. I don’t know what it means.” He concedes that tightly regulated marijuana, which has been fully tested, would not have as many chemical additives as cigarettes.

But even if the cannabis tests clean, Springer said, smoke itself is bad for the lungs, heart and blood vessels. Other researchers are exploring the possible relationship between marijuana smoke and long-term cancer risk.

Certainly, living with a smoker is worse for your health than just going to a smoky concert hall. But, Springer said, the less you inhale any kind of smoke, the better.

“People should think of this not as an anti-THC conclusion,” he said, referencing the active ingredient in marijuana, “but an anti-smoke conclusion.”

So, is the solution simply to avoid smoke from combustion? In other words, is it safer to eat cannabis-infused products, or use “smokeless” e-cigarettes or vaping devices?

Caution on vaping

Springer still urges caution on that score because vaping, for example, can have its own health effects. Vaping devices don’t produce smoke from combustion, but they do release a cloud of aerosolized chemicals. Springer is studying the health effects of those chemicals, too.

All this research takes time. Meanwhile, Springer worries that people might come to the wrong conclusion — that the absence of research means the secondhand smoke is OK.

“We in the public health community have been telling them for decades to avoid inhaling secondhand smoke from tobacco,” Springer said. “We have not been telling them to avoid inhaling secondhand smoke from marijuana, and that’s not because it’s not bad for you — it’s because we just haven’t known. The experiments haven’t been done.”

Antismoking campaigners say we can’t afford to wait until the research is complete. Recreational pot is already a reality.

Cynthia Hallett is the president of Americans for Nonsmokers’ Rights, based in Berkeley, California. The organization was established in 1976, before there was a lot known about the health effects of secondhand smoke from tobacco.

Cannabis more common

Now that cannabis is becoming more common across the country — more than 20 cities or states have legalized it in some form — her organization is taking on the issue of secondhand marijuana smoke, too.

Hallett says some of the arguments being made in support of cannabis remind her of the arguments made on behalf of tobacco decades ago.

“I’m seeing a parallel between this argument that, ‘Gee, we just don’t have a lot of science and so, therefore, let’s wait and see,’” Hallett said. “The tobacco companies used to say the same thing about tobacco cigarettes.”

In California, smoking cannabis is prohibited anywhere tobacco smoking is prohibited — including schools, airplanes and most workplaces. Hallett is worried that the legalization of pot could be used to erode those rules.

It starts with the premise of decriminalization, she said, and then, over time, there’s “a chipping away at strong policies.”

When it comes to marijuana, Hallett said, “it is still polite for you to say: ‘Would you mind not smoking around me?’”

Cannabis dispensary

At Magnolia, a cannabis dispensary in Oakland, California, pot smokers talk about what responsibilities — if any — they should have when it comes to nearby nonsmokers.

“This is the first time that I have heard secondhand smoke in reference to cannabis,” said Lee Crow, a patient-services clerk at Magnolia. “I’ve tried to be courteous — just common courtesy, like with anything.”

The dispensary’s director of clinical services, Barbara Blaser, admits she thinks a lot about secondhand smoke from cigarettes, but not pot.

“Both of my parents died of lung cancer!” she said. “I will stop a stranger and say, ‘You shouldn’t be smoking. My dad died of that!’ ”

California’s Proposition 64, approved by state voters in 2016, requires that some of the state tax revenue from the sale of marijuana be distributed to cannabis researchers. In addition, the state’s Occupational Safety and Health Standards Board is examining workplace hazards that are specific to the cannabis industry

more: http://usa.inquirer.net/11114/secondhand-marijuana-smoke-poses-risks-early-science-says#ixzz5AdszFgYd 

Share this post

Link to post

More anti-cannabis scaremongering.........you don't get polonium poisoning from pure cannabis smoke second hand or direct which you cannot say the same for tobacco. 2p 

1 person likes this

Share this post

Link to post
3 hours ago, DomTong said:

More anti-cannabis scaremongering.........you don't get polonium poisoning from pure cannabis smoke second hand or direct which you cannot say the same for tobacco. 2p 



1 person likes this

Share this post

Link to post

But pushchairs all at exhaust pipe height in city centres is totally cool .... lol


2 people like this

Share this post

Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now