JoJoDeathunter said:
Well according to your profile you are 14, so now's a good age to be trying out drinking and smoking if you haven't already, trying each a couple of times won't harm your health! If he/she is really your friend though they won't mind if you choose to abstain and not attend certain parties etc, if you so wish. I'm a bit older but I certainly wouldn't drop a friend for such minor issues, if he/she gets lung cancer or liver failure then that's their problem, not yours.
From the tone of alarm in the OP, he probably isn't in the sort of environment where this behavior is the norm for people at such a young age. And if there's no blatant social pressures encouraging recreational substance use, then there's probably some underlying issue with the OP's friend.
And in that case, OP, look at your relationship to them. Are they having a hard time? Do you feel like this is a manifestation of their being in some sort of downward spiral, or are they just all to eager to party?
I saw a friend smoking at 17. I was in a vehicle so I couldn't talk to her in person, so I simply texted her. She'd been having a rough time with a relationship and her family, and I told her that she's a really great person, and she didn't need to go and attach herself to an addictive, expensive crutch like that. (I phrased it better at the time, but that's the essence of what I said)
Turns out that was just the sort of thing she needed to hear. I haven't seen her in a year, but I didn't see her smoking any for the time I was around her after that and she noticeably perked up.