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Inhaling second-hand marijuana smoke for just one minute may damage blood vessels, new research out of the United States shows.

It also suggests that our bodies may take three times longer to recover than after breathing second-hand tobacco smoke, according to a paper published in the Journal of the American Heart Association.

Researchers at the University of California, San Francisco’s Division of Cardiology say their findings on rats will further dispel the widespread belief” that cannabis is harmless.

Inhaling second-hand marijuana fumes on a regular basis could cause the arteries to harden, increasing the risks of heart attacks and strokes, they maintain.

The scientists also found that just the burning of the plant material appears responsible for the impaired blood vessels, not chemicals like nicotine and (THC), the psycho-active ingredient in marijuana.
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