Pot Smoke Less Harmful Than Thought

Occasionally smoking marijuana does not harm lung function over time.
0:26 | 01/11/12

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Transcript for Pot Smoke Less Harmful Than Thought
One of the longest and largest studies on the health effects of marijuana shows that a case pot smoking does not harm your long. The results of the twenty year study -- -- UC San Francisco bolsters existing evidence that marijuana smoke doesn't do the kind of damage that tobacco tax. Occasional smoking by the way is one or two joints -- week the results are easier for heavier users.

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