Several times a week, Joe and his blockmates stuff towels under their door, open the windows, turn on a fan, and get stoned.

Occasionally, Joe says, he and his friends will head down to the bank of the Charles River and light up joints right out in the open. Joe, a Harvard senior who didn't want his last name used for fear that potential employers would look unfavorably upon his marijuana use, says he never worries that his recreational drug use will land him in legal trouble.

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