I dont smoke and the only time that I have ever tried 'waccy baccy' I 'whitied'. I am not a fan of drugs, although I do like booze - some would say that its the same difference.
I Am sorry i do not have the actual facts and figures to answer that part of your question as it does require statistical information, i based my original answer on my opinion.
I know people from all walks of life that use it. I know more people who get cranky without a coffee than those that do without a joint. I smoke it occasionally, I'm not for a minute suggesting it is good but it's probably doing me no more harm than my normal cigarette habit.