Well there isn't too much more to say... but its obviously mostly dependant on the strain
you grow - but in general Harvest earlier if you want more of a head stone.
I recently had to harvest a lady at 5 weeks - (she would normally go 8-9....

)
The effects were ALL in the head and overall I was really surprised how pleasant it was. This was a seriously resinous girl mind - so that helped...
Don't think for 1 minute that I would suggest anyone harvest plants so early..
The smoke was nice but it was quite hollow and you could feel it was a bit lacking...
Best advice is really just suck it and see....
This is JH after all..... I'm sure you won't be dissapointed...
Laz