Is Secondhand Marijuana Smoke Dangerous? Biologist Says Yes

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CBS Local — As the government continues to crack down on tobacco products, more and more states are easing up on marijuana laws.
One biologist is now saying those policies are misguided after finding that secondhand smoke from marijuana users may be just as deadly as cigarette smoke.
According to Matthew Springer, a professor at the University of California, San Francisco, marijuana smoke is three times worse for the arterial walls tha