You can drive while high? Not legally. You're under the influence even if it's marijuana. Even if you're more capable of it, it's not a good idea if you want a future (a lot of professional companies check your past. DUIs can fuck you over.)
In the 4 years I've been smoking weed, not once have I had any problems driving while high, which is hundreds of times. None of my friends have had any problems, either.
I'm saying it's possible and easy to drive high, while it's practically impossible to drive drunk.