My friend's problem is weed. He smokes everyday multiple times and It brings him down.. He also sells sometimes when they call him. I convinced him to buy the book Game and he started reading it (he wants to be good with women, but weed stops him doing something else than smoking) . I think pickuping is alot more adventurous, because I have also lived that kind of stoner lifestyle and its antisocial drug. I dont know much about pick-up yet, but I think when we both start learning it together, it is much easier, because we can talk about it and try together. Push each other forward. What do you guys think?? and what should I tell him to motivate him to stop smoking??

By stopping him from dragging YOU down, hang with more motivated people.
Let him hear about all the hot girls you've pulled in your progress.

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They call me the cat whisperer, cause I know exactly what the pussy needs.

Hey man, most probably, weed is not the main problem. I used it for couple of years my self(stopped, 2 month clear), occasunaly a lot, like your friend, and i dont have that problem. Weed actually just boost your mood, if you dont smoke shit ofcourse(if do=stoned). Its all but antisocial drug, at least for me. Personally, i like to go on out high, day or night, meet new people and do random fun stuffs.

I think your friend is antisocial by it self. Convincing him to stop smoking weed will not make the problem disapear, but he may be slightly more active. There really is nothing you can say to stop him from smoking, he must make that decision by him self, everything else is counter-productive.

About selling, somehow you must make him to stop, since it can make him big problems. Longer he sell, deeper he is in. I have no idea how, i dont have any experience with that.

Weed is complicated. It, like alcohol, is a crutch for people who have something deeper going on psychologically. It would probably be best just to tell your friend how you feel. Maybe have an intervention. If that stuff doesn't work you're going to have to cut him out of your life. He's the one with the problems, don't let those problems become yours.

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The ultimate lesson of psychoanalysis is that human life is never "just life": we are possessed by the strange drive to enjoy life in excess, attached to a surplus which derails the ordinary run of things.
-Slavoj Zizek