[ConservingFreedom]

Someone who tried pot once at a college party

I doubt that many of those lifetime-but-not-current users tried it only once - although I have no data on that.

[offwhite]

"I doubt that many of those lifetime-but-not-current users tried it only once"

The category is "ever used". If you tried marijuana once, twice, three times -- you fall into that category. Trying marijuana once, twice, three times means nothing. It's a useless statistic.