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Secondhand Pot Smoke Bad for Blood Vessels

Pot may have health consequences even for nonsmokers. It’s well known that secondhand cigarette smoke damages blood and heart vessels, but a new study by UC San Francisco researchers indicates that secondhand marijuana smoke may actually be more harmful to them. As with tobacco smoke, exposing lab rats to pot smoke for 30 minutes resulted in a 70 percent reduction in their blood vessel function, but whereas blood vessels have been found to return to normal 30 minutes later in the case of tobacco, they were still functioning poorly 40 minutes after exposure to marijuana smoke. Even worse, by some lights, blood vessels were effected even when the pot contained no high-producing THC. Those smoking pot for medicinal reasons may want to do so only by themselves or outdoors in open air.

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