As a mathematician, I'm going to have to go ahead and disagree with you on "exponentially" and "infinitely" there.

it's hyperbole, not science. fair enough, though.

I'm going to disagree here too. I've never been much of an alcohol drinker. I've probably had six standard drinks in the past year.

If I drank a six pack of beer right now I'd probably pass out, while some of the people I work with would still be able to drive quite well.

Something roughly equivalent applies to marijuana.

if you smoked a joint (or 6 joints, whatever) with no tolerance you'd probably just want to eat a twinky and have a nap instead of driving.

even if you didn't, your motor control wouldn't be nearly as impaired, nor would your mental faculty.

your judgement also wouldn't be as impaired as having a 6 pack of beer with no tolerance, making it even less likely you get behind the wheel while too intoxicated.

I'd call that a "false" equivalence, not a rough one.

Fair points, and I agree with the impaired judgement thing too, and you're right it is a false equivalence.

I'll be honest...

What I meant to say was, talking from experience: when I smoke six bongs of straight or strong mix, there's no way I should drive a car. Mostly because I'm too busy laughing or sleeping.

Whereas last time I drank half a bottle of spirits I woke in a strange bed and could see my car out the window and had no recollection of how it got there.

Alcohol is one hell of a drug.