Well, technically, I'm still in high school, but I don't have any interest in drinking, smoking, etc. I have actual hobbies, and poisoning myself isn't one of them. As for sex, well, it exists, can't say I can see the appeal of it much either, except as part of a healthy relationship, and I have more important things to pursue than relationships; I'm pretty sure a fair amount of people who are about my age, on the other hand, are quite the opposite. Part of my attitude is disinterest, the rest is is strict adherence to the law.
Edit: While I can understand not wanting to be with people who do/did these things as teenagers, adults have every right to drink, smoke(though I can't imagine being around people who smoke frequently being pleasant) and have sex. Ilegal drugs are, well, it's in the name. Alcoholism would also be a concern, but casual/social drinking is normal. The only reason to care if someone has had sex before is STDs; virgins are, obviously, unlikely to have them. My view being that before having sex with someone you haven't before is to both get checked, even if none of the partners have had sex before, STDs can be caught from needles, including discarded ones, and people have accidently stepped/fell on them before. I'm extremely into the safety part of safety vs. risk, though, probably overzealous about it. That is to ensure safety for all participants, however, not elitist 'morals'.
