9 out of 10 smokers started [i]by[/i] age 18. Which means MOST of them started doing it illegally. So yes making it legal will just make the general public even more prone to health problems and make it more affordable for minors to receive the drugs.

Um... what? There isn't an age limit on weed because it's illegal. The reason minors are able to get it so easily because they can walk down the street and buy a gram for $20 easily. Now if it were regulated and sold like cigarettes, and maybe even processed into pastries, your in a different ball park because it'll be a lot harder to buy as a kid.