I've been smoking for some 11+ years now. I haven't really gone through a "right, that's it, I'll stop smoking from "x" week", but I do wish I never took it up. Truth is, I do like the occassional light-up, like with a whisky or an after dinner thing, or to have a break from at work. But on the whole, as stated before, I wish I never took it up. The stupidity of my decision to begin smoking didn't even begin with the usual "I wanna be cool" thing. If you do decide to quit, try not to lapse. I think it will be the best decision you ever made.