Went through a stage at around 14 where I'd go out in the woods on my bike with a mate to drink, when that got boring I got into smoking, then every party I went to tried scoring some drugs, anything, but wanted my mates to get it since I hadn't tried anything before...
You have no idea how glad I am that I never got any myself, and all my friends were quite unreliable XD
I've kicked in smoking baccy now and on an e-cig, which I hate myself for doing, the girlfriend hates it but trying to quit every other way hasn't worked for me at all.
Peoples attitudes change all the time, so much so that even though I hate smoking with a passion, it's still the first thing I do every morning :/
Just glad I didn't get hooked on anything else when I was being experimental :/
I'm glad I have this attitude now though, since I'm always being invited out to get high even though they know I never will, peer pressure wont work on me any more