9 - alcohol, caffeine
11 - weed (thanks to older siblings of friends)
12 - lsd, nicotine (once again thanks to older friends)
13 - coke, meth
15 - heroin
16 - psilocybin, MDMA, MDE, DXM, Opium, Crack, Ketamine, PCP
17 - DMT, DPT, 5-meo-DMT, AMT, MDA, mescaline, amphetamines, barbs
19 - nitrous, benzos
20 - BZP
21 - 2-cb, 2-ci