RESULTS: Current marijuana users had significantly smaller waist circumference than participants who had never used marijuana, even after adjusting for factors like age, sex, tobacco and alcohol use, and physical activity levels. They also had higher levels of HDL ("good cholesterol"). The most significant differences between those who smoked marijuana and those who never or no longer did was that current smokers' insulin levels were reduced by 16 percent and their insulin resistance (a condition in which the body has trouble absorbing glucose from the bloodstream) was reduced by 17 percent.
People who had previously used marijuana, but not in the past thirty days, tended to have similar outcomes, but to a much lesser degree. In addition, none of these measures were impacted by how much marijuana people reported smoking.
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