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All those ads about parents being the anti-drug? Yeah, well, there's a reason they didn't work:

Today, however, the fastest-growing population of drug abusers is white, middle-aged Americans. This is a powerful mainstream constituency, and unlike with teenagers or urban minorities, it is hard for the government or the news media to present these drug users as a grave threat to the nation.

Among Americans in their 40s and 50s, deaths from illicit-drug overdoses have risen by 800 percent since 1980, including 300 percent in the last decade. In 2004, American hospital emergency rooms treated 400,000 patients between the ages 35 and 64 for abusing heroin, cocaine, methamphetamine, marijuana, hallucinogens and "club drugs" like ecstasy.

And that's why your stash disappeared when you visited Mom and Dad over the holidays.

This Is Your Brain on Drugs, Dad [NYT]