I used to smoke weed, until i realised how much of a lazy cunt it made me. So i did something about it. I don't smoke cigarettes, or take any other drug. All i have left is drinking. I might even give that up at some point. Although i do like a good beer or whiskey once in a while.
Like Vicey, i like to be in control of my body. Not monging out in a corner somewhere hoping someone will bring me food, even if i'm the only person in the house... Weed makes people lazy and paranoid, that's from personal experience and from observation of others.
Anyway, that's my opinion.