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s2smodern

Nearly a century after the film “Reefer Madness” alarmed the nation, some policymakers and doctors are again becoming concerned about the dangers of marijuana, although the reefers are long gone.

Experts now distinguish between the “new cannabis” — legal, highly potent, available in tabs, edibles and vapes — and the old version, a far milder weed passed around in joints. Levels of T.H.C., the chemical that produces marijuana’s high, have been rising for at least three decades, [...]