(MENS FITNESS) — Ever get so high you can feel it in your bones?

That might not be a good thing.

People who smoke “heavy” amounts of pot have a lower bone density, lower body mass indexes (BMI), and an increased risk of breaking bones than do people who only smoke “moderate” amounts of pot, according to a study published in September in the Journal of the American Medical Association. (“Heavy” users are defined as those who have smoked at least 5,000 times over a lifetime, although the researchers note that the average “heavy” user had smoked 47,000 times over a lifetime.)

Using an x-ray technique, the researchers measured the bone densities of 170 British stoners and compared them with people who only smoked cigarettes. After statistically controlling for other factors, the “heavy” stoners had bones that were 5% less dense than the non-“heavy” groups.

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