Article: Ask Tip Sheet: Readers' questions answered by NEWSWEEK's experts. This week: Are the effects of marijuana use irreversible?(Questions and Answers)(Brief Article)

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Are the effects of smoking marijuana, specifically the destruction of brain cells, irreversible?

-Kirk Denson, Petaluma, Calif.

If a brain cell dies, death is indeed permanent. New research from the University of California, San Diego, suggests marijuana doesn't destroy neurons, though it can still cause a host of short-term problems, including impaired memory, ...

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