With great fanfare last week, the White House drug czar, John Walters, announced a new study that marijuana can cause depression and addiction in teenage users.

In response, drug policy reformers argued Walters was blowing smoke again to scare people away from a substance that they claim is no more dangerous than alcohol and should be decriminalized if not outright legalized, just like alcohol.

Both sides are missing the fundamental point. Marijuana is a drug. People use it to r ...

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