i have done coke,weed, x ,pain killers, anti depressants, alcohol, nicotine,and of course caffine, aderol.... pretty much everything except pcp, herione, acid, and meth from what i can think of. This is mainstream of course because i have never messed with inhalants and other chemicals that will mess you up.(listed on erowid.com)
I am "addicted" to nicotine, or it is an everyday habbit rather. I also smoke weed about everyday, only because i cant find a reason to quit while i am in highschool and probably college because it doesnt seem to make me loose focus or not be able to do well academically. I will quit smoking weed when i get a steady career and family. I do not believe that would be tough. Nicotine will be tough, but i agree that it is mostly mental.
Cocaine is pretty addictive to a certain degree. It will have you craving the high, but i think it is very easy to realize... " Oh man i can not keep spending this money and being so out of it" I did it pretty heavily for 3 months and havnt touched it in a year.
All other drugs i have tried were not "addicting", this could be because most of the other drugs i tried were not readily available. The main thing that gets me with drugs is the money. I cant spend a lot of money for something that is gone very quickly.... the negative consequences out weight the positive effect.