Yeah, medicinal, wtf is this shit about stoners being too stoned to function in society? Many people I know function a lot better in society when stoned, as they're more pleasant and friendly with others, more deep-thinking, and take a greater interest in just about anything.

And yes, there should be penalties for driving high ONLY if you're so fucked up it's making a noticeable and unsafe difference.

And yes, also, it would inherently invoke a greater responsibility if legal because suddenly it isn't a dirty crime only for burnout losers, but an accepted part of social society, which would change people's behaviour.