Secondhand marijuana smoke may damage blood vessels as much as tobacco smoke

11/16/14–Breathing secondhand marijuana smoke could damage your heart and blood vessels as much as secondhand cigarette smoke, according to preliminary research presented at the American Heart Association’s Scientific Sessions 2014. In the study, blood vessel function in lab rats dropped 70 percent after 30 minutes of exposure to secondhand marijuana smoke. Even when the marijuana contained no tetrahydrocannabinol (THC)—a compound in marijuana that produces intoxication—blood vessel function was still impaired. This suggests that the compound isn’t responsible for the effect. Read