1. It Can Damage Blood Vessels

Secondhand smoke may not seem all that bad. But it can have a major impact on your blood vessels, according to research from the American Heart Association. After rats inhaled secondhand marijuana smoke for one minute, their arteries carried blood less efficiently for at least 90 minutes. When they were exposed to secondhand tobacco smoke, however, their blood vessels recovered after 30 minutes. "While the effect is temporary for both cigarette and marijuana smoke, these temporary problems can turn into long-term problems if exposures occur often enough and may increase the chances of developing hardened and clogged arteries," said study author Matthew Springer, Ph.D.

2. It May Increase Testicular Cancer Risk

Researchers at the University of Southern California found smoking weed may increase your odds of getting testicular cancer. In the study, men who had testicular germ cell tumors were more likely to report previously using marijuana than those who didn't have the tumors. A doctor for the American Cancer Society said that while the findings were interesting, more research needs to be done to determine if there was a causal relationship between cancer and marijuana use.
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