QUOTE (Laughing Grass @ Oct 24 2009, 11:04 PM)

One of the most regularly told urban myths regarding cannabis talks about various other recreational substances such as PCP or cocaine being used to adulterate cannabis.
PCP could be what he meant. Is it really an urban myth? From Wiki:
QUOTE
Recreational use
Illicit PCP seized by the DEA in several forms.
PCP comes in both powder and liquid forms (PCP base is dissolved most often in ether), but typically it is sprayed onto leafy material such as marijuana, mint, oregano, parsley, or ginger leaves, then smoked.
PCP is a Schedule II substance in the United States, a List II drug of the Opium Law in the Netherlands and a Class A substance in the United Kingdom.
[edit] Method of absorption
The term "embalming fluid" is often used to refer to the liquid PCP in which a cigarette or joint is dipped, to be ingested through smoking, commonly known as "boat" or "water." Smoking PCP is known as "getting wet." A tobacco cigarette or cannabis joint dipped in PCP is called by the street names "sherm stick," "sherm," "fry stick," "amp," "toe tag", "dippa", "happy stick," and "wet stick." There is much confusion over the practice of dipping cigarettes in "embalming fluid" leading some to think that real embalming fluid may actually be used. Smoking actual formaldehyde will cause intoxication, but may cause serious health consequences beyond those of consuming PCP, due to the toxicity of formaldehyde and other embalming chemicals. The slang term "embalming fluid" likely originated from PCP's somatic "numbing" effect and the feeling of physical dissociation from the body. This is one of the fastest growing means of using PCP, especially in the western United States where its is sold for about $10 to $25 per joint or cigarette.
In its pure (base) form, PCP is a yellow oil (usually dissolved in petroleum or diethyl ether or tetrahydrofuran). Upon treatment with hydrogen chloride gas, or HCL saturated isopropyl alcohol, this oil precipitates into white - tan crystals or powder (PCP hydrochloride) In this form, PCP can be insufflated, depending upon the purity. However, most PCP on the illicit market contains a number of contaminants as a result of makeshift manufacturing, causing the color to range from tan to brown, and the consistency to range from powder to a gummy mass. These contaminants can range from unreacted piperidine and other precursors, to carcinogens like benzene and cyanide - like compounds such as PCC (piperidinocyclohexyl carbonitrile).
[edit] Effects
Behavioural effects can vary by dosage. Small doses produce a numbness in the extremities and intoxication, characterized by staggering, unsteady gait, slurred speech, bloodshot eyes, and loss of balance. Moderate doses (5–10 mg intranasal, or 0.01-0.02 mg/kg intramuscular or intravenous) will produce analgesia and anesthesia. High doses may lead to convulsions.[15]
Psychological effects include severe changes in body image, loss of ego boundaries, and depersonalization. Hallucinations and euphoria are reported infrequently.[15]
The drug has been known to alter mood states in an unpredictable fashion, causing some individuals to become detached, and others to become animated. Intoxicated individuals may act in an unpredictable fashion, driven by their delusions and hallucinations.
Included in the portfolio of behavioral disturbances are acts of self-injury including suicide, and attacks on others or destruction of property. The analgesic properties of the drug can cause users to feel less pain, and persist in violent or injurious acts as a result. Recreational doses of the drug can also induce a psychotic state that resembles schizophrenic episodes which can last for months at a time with toxic doses. Users generally report an "out-of-body" experience where they feel detached from reality, or one's consciousness seems somewhat disconnected from consensus reality.
Symptoms are summarized by the mnemonic device RED DANES: rage, erythema (redness of skin), dilated pupils, delusions, amnesia, nystagmus (oscillation of the eyeball when moving laterally), excitation, and skin dryness.[16]