QED.
Once people see one friend take a few drinks and stumble around, and another one smoke a joint and seem mostly unaffected (except for the giggling); once they see their roommate light up twice a year to celebrate the end of finals, but not crave it the rest of the year; once they talk to aunts and uncles, or even parents, who smoked regularly through the 60s then gave it up when they left college and started their careers; they start to question what they've been told.
Thank you for making my argument. A textbook example. Nicely done, truly.
