I need a good website about marijuana addiction!

My boyfriend has been smoking pot for years and I'm trying to get him to quit because i believe it is the source of his extreme moodiness(which is effecting our relationship). Do yall know of any good websites where i can find GOOD info on this, to prove this is the cause. any advise?

: http://alcoholdrugstreatment.info/i-need-a-good-website-about-marijuana-addiction