actually, certain drugs arent lethal when you take them
if you take a certain amount, youll get it's effects with full control over yourself....
Alcohol is the same, a drink or two will still give you control over yourself if you are used to drinking, such as my dad, he drinks alot, so he can drink a couple of beers, and still be able to walk properly, talk properly, and pass those tests they give you when youre drunk....
if you dont know what your limit is, then you wont be able to control yourself if you drink.....