I keep seeing the following in people's journals:
98% of the teenage population has tried pot. If you're part of the 2% that hasn't, copy this into your journal.
Where's this 98% coming from, guys? The National Institute for Drug Abuse, which one doubts would be inclined to underestimate usage, reports:
The percentage of youth age 12 to 17 who had ever used marijuana declined slightly from 2001 to 2002 (21.9 to 20.6 percent). Among adults age 18 to 25, the rate increased slightly from 53.0 percent to 53.8 percent in 2002. The percentage of young adults age 18 to 25 who had ever used marijuana was 5.1 percent in 1965, but increased steadily to 54.4 percent in 1982. Although the rate for young adults declined somewhat from 1982 to 1993, it did not drop below 43 percent and actually increased to 53.8 percent by 2002.
So speaking roughly, about half of teenagers have ever used marijuana.
I don't usually go out of my way to take pot shots (no pun intended) at a meme, and the "put this in your journal if you've never used marijuana" half is fine. But this isn't a quiz meme, it's a factoid meme, and the factoid is wrong.