I've spent many a thought on wondering about whether one can form patterns about what sort of people use or abuse certain drugs, why some people have no problems with dependence, and why others just lose their life to them. For some reason I'm actually quite acquainted with the notion that people can be categorised in one way or another by their personality, I don't know why, my analytical side just takes over.
In any case, after initially trying to categorise the 'majority' of drug users by intelligence, creativity, personality, misfits, people who want more, etc etc its just too difficult to do so. I think it may be true to say creative people are more likely to experiment with mind altering substances than some people, but not that the majority of drug users are creative people. As far as using/abusing making people more creative, once again, I don't think its accurate to give a yes or no answer, for some people the drugs open their mind like a blossoming flower, and others it shuts down its thought process - and thats why they enjoy them.