I'm assuming you've had no curiosity then? Really? I find that rather odd.
Same, I grew up in a house where none of that stuff was really present, except that my mom smokes, and I've ended up drinking, smoking (rarely, never enough to actually get addicted) and smoking weed on occasion (not nearly every day, or even every month).
Maybe it's because I grew up with none of that around me, but I was always curious about all that stuff even from an early age (I remember telling my parents that I was interested in alcohol when I was 12. Not about getting drunk, but about drinking alcoholic drinks).
In all honesty, I don't see why people bother not to try things once. I mean, if your smart about things it's not like getting smashed once is gonna fuck your life up, or that getting high will automatically make you into some useless porch monkey like the propaganda said it would. And I certainly disagree with anyone who thinks they are somehow superior for not having done anything.
I will respect someone's decision not to do any of that stuff. I do have a friend who basically doesn't do any of that at all, I dunno if he's ever had a drop of alcohol in his life and I actually respect him for his self control since I've seen him at parties with everyone drinking and stuff. But I disagree with any sort of ideology that it's better not to have at least tried things.