You guys have such forgeted up views about drugs, lol. To me, doing a drug is like playing a video game. You don't play a video game because you're unsatisfied with life, you do it because it's fun. It can be a social activity or a single-player one. Could you have done something else with your time that would have been more productive? Sure. But some times you just want to sit back and play your favorite game for a few hours. It makes you feel good and allows you to focus on something other than your stressful daily life.
Also, tobacco isn't like heroin. It's not so addictive that one cigarette will get you addicted. I agree that most people should try a drug at some point in their life, but obviously I agree with Fez when he says that if you don't want to, you shouldn't have to. Having a healthy relationship with drugs doesn't have to be a lifestyle, for many people it's just another activity to choose from.