Caffeine: 5.
Nicotine/tobacco: 14 (I only smoke after smoking a bowl.)
Marihuana: 16. (still do it regularly)
Salvia: 18.
Nitrous: 18.
Coke: 18. (Gross. I never want to do it again.)
DXM: 18.
Alcohol: Took my first sip when I was 10. I only drink, like, once every 6 months.

I'm 18 now.