Well, it could either be that the drug itself makes them act weirdly, or perhaps they were weird already and they took up drugs to help them forget that they are weird. It''s one of those complex philosophical questions, like 'which came first, the chicken or the egg'? However, as far as I'm concerned, unlike most philosophical questions, which are intriguing and worth a person's contemplative time, this one, in my view, doesn't rise to that level....mainly because I haven't met any druggies that have made me think that they have any intellectual insights to add to the discussions of the day.