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Occasional Pot Smoking Won't Harm Lungs: Study

20-year study finds a few joints a month have no effect, but other experts differ

Armentano added that, in his opinion, science has determined alcohol, tobacco and prescription drugs "to be far more dangerous and costlier to society than cannabis," but they are regulated instead of banned.

More information

There's more on marijuana at the U.S. National Institutes of Health.

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respiratory problems,

drug abuse,

lung cancer

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