i dont think either bush nor obama should have been allowed to be presz based upon the drug use. i dont buy into "Everybody does it..." when the person is 21 or 22. It's a felony, right? What if "Hey, everyone steals cars at 21.... everyone does home invasions... everyone does a little coke smuggling... etc etc.
If you're 18, you're an adult. Doing drugs at any adult age shows you have some shitty judgment and dont respect the law of this land as an adult. Any other felony, and that person is NO WAY ever going to be president. But snorting cocaine - buying cocaine, transporting cocaine... that's all cool, right? nope, sorry.