Typical, very typical.

People who can limit themselves, sure. I've known people who are very intelligent and smoke weed, occasionally. Most people can't limit themselves, though, and spend a lot of time and money and treat it as a hobby. I haven't known many people like that with high IQs. Besides, I'm waiting for Sum Yung Guy's reply anyway.

Oh yea, and the "Einstein Moments," those times that you have a feeling of elevated intelligence when using a mind altering drug, that doesn't account for a high IQ.