I can drive just fine high, but I tend not too. I am an aggressive, performance oriented driver and I hit the track for drifting and autocross a lot with my car. I drive a million times better sober! I find when I am high my reaction time is actually a bit delayed and my sense of things is just a bit off. When I am driving back roads with lots of cornering, it's just much more fun when my mind is not distracted and I can give driving my 100% attention.