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Do psychoactive drugs affect behavior, or not? If they do affect behavior, then can we say that everything people under the influence do is simply their own choice?

Caffeine is also a psychoactive drug, but overworked engineers don't blame coffee for 20 hour work days, instead, their coffee habit is understood as a supplement to their chosen lifestyle. Pot functions the same way for someone who decided to sit on the couch and play xbox all day; the pot didn't intoxicate him into playing video-games instead of going to class, if class was important to him he'd just go, stoned or otherwise.

edit: s/weeks/days