Marijuana is becoming more mainstream: more than 20 states have legalized it in some form, and several others are mulling relaxing their pot laws. Many public-health experts speculate that if marijuana becomes a substitute for alcohol, this shift may have a positive overall influence on the health of American adults. But many of these same experts worry that the blaze of decriminalization will harm young people, who suffer disproportionately from pot’s ill effects. Is there a way to let adults toke while keeping marijuana out of the hands of high-schoolers?

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