If you're walking down the street and see (or smell) someone in front you smoking a cigarette, your first reaction might be to speed ahead to avoid breathing in the secondhand smoke.
According to the U.S. Surgeon General's 2014 report on the consequences of smoking, secondhand tobacco smoke causes an estimated 34,000 premature deaths from heart disease each year in the U.S. among nonsmokers.
But, what about medical marijuana?
Even though there isn't any nicotine in marijuana, would secondhand smoke be just as bad?
Dr. Matthew Springer shares his study on medical marijuana and secondhand smoke.