Marijuana when I was 15
Tried cigarettes, alcohol, shrooms later into 15.
At the very end of 15 I started to IV coke alot, well into 16. I stopped and started IVing heroin late into 16. I experienced IV Meth at 17, and IV'd acid, ketamine, oxy, crack around those times too. The only drug I continued to do after the age of 17 was IV Heroin.
Ive done many drugs, obscure and otherwise between 16-17 but only IV heroin is the one I continue to do, with the complimentary cigarette of course.
On a side note, marijuana is a gateway drug and alcohol is not, I disagree with your thesis here enoughorangejuice?. The reason is that marijuana is illegal and connected with the drug underground and black market, while alcohol is not (even among minors and underage drinking).
When you drink some whisky or smoke cigs, it's not a big deal. It's legal, socially condoned if not accepted, and it does not give you insights or connects into the black market.
Marijuana, however, opens up a "pandora's box" into illicit substances and the black market.
I'm not saying this can't be changed, but at the moment, that's how it is. In the same sense of course, anything illegal can be a gateway drug.