Is Secondhand Marijuana Smoke Bad for You?

Inhaling secondhand marijuana smoke even for just 1 minute may temporarily affect how blood vessels function, according to a new study done in rats. After the rats had inhaled secondhand marijuana smoke for 1 minute, their blood vessels took at least three times longer to return to their normal function, compared with the time it took the same rats' blood vessels to recover after they had inhaled secondhand tobacco smoke. Because the study was done in rats, the researchers don't know for sure wh