Everyone knows (or at least should know) that driving is dangerous.
You risk you live and the lives of others every time you step into a car.
Exactly. If you are not willing to accept that risk, then you should not get on the road. People drive intoxicated, high, tired, with bald tires, etc, all the time. Drive (or not) accordingly.
I wish they'd give licenses to speed and special lanes for it as well. That'd be a tax I wouldn't mind paying.
If there where extra lanes for driving high I would be perfectly OK with it, than I would know what I'm getting at when entering them.
Even in a stateless society where roads would be privately owned, there would be certain rules applied to driving (like a sign "With entering this road you agree to drive by the Standard driving rules, as can be found here [QR-Code]).
But besides, take it as you will, butting this extra danger on other people only for you one convenience is IMO still morally weak.