[cercatrova]

> how many 19-year-olds do you know who want to live in a dorm setting and show up on time?

Most college kids? Even the no-drinking part these days comprises many college students, the number of young people who don't drink is rising.

[OkayPhysicist]

50% of under-21 college students engage in underage drinking. The number for of-age students is even higher. 44% use cannabis. We can safely say that those two groups overlap significantly, but barring people who consume either dramatically cuts back on your potential pool.

[xNeil]

Per my experience, I can't attest to that of cannabis, but the percentage of students drinking alcohol underage is significantly higher than 50% in every college I have heard of or visited.