I'm 39 now, although the fun part of my mind, which is the dominant part, is still about 16 or so. I smoked a very little in college. It never had an effect on me. I would never touch the rough stuff. I drank enough from the age of 17 to 25 to pickle several normal people's livers. Fortunately for me I smartened up and haven't had a drink since. Don't miss it a bit.
You're a smart kid not to get into it. I came to a point in my life where I realized that if I couldn't have a good time sober then I needed to change some things in my life so that I could. I did that and now have no need for it. I'm fortunate too because I had a very high tolerance, especially when I was in my teens. I needed to drink a half a bottle of gin or vodka to get a comfortable buzz. Tough on the liver and the wallet!