Interesting topic. I hope Mehdi has our personal info on lock-down
Dope, reefer, weed, pot, ganja, maryjane, doobage, whatever.... Personally, if you can control your shit, who cares if you smoke? It's nowhere near as bad as alcohol. By "controlling your shit" I mean you have a job, GO TO IT every day, pay your bills/taxes and are otherwise a socialized individual who isn't harming anyone else, knock yourself out. Smoke till your eyes bleed. Enjoy it. Just don't let it own your life. As a disclaimer, I don't advocate the use of it by growing minds. Get yourself through high-school, get a degree, get established...then buy some GOOD reefer
I'm going to disagree with "Carnal's Treatise" only in this aspect; not everyone is affected by reefer the same way. While some people may become lazy and unmotivated, some other people actually become unlazy and motivated by it.....

not that I have any experience.
Alcohol, rotgut, firewater, whatever.... fucking evil, but I loves me some beer. I say evil because it's easy to get and easy to abuse. Some people use alcohol to "get by". Some people understand how it's intended to be enjoyed. Most people have probably been both at one point in time or another. In some cases, it's encouraged. Alcohol is physically addictive. Dope's not, I don't care what study you throw at me. I've been addicted, I know what withdraw is and I NEVER feel it with dope(not that I know anything about that).
Everything else(except mushrooms).... as a very, very good friend has told me, "will steal your soul"
I'm a pretty big fan of "most(not all!) things in moderation". I think a happy balance can be achieved if people would just think more about it.