Despite its reputation for the munchies, new research shows that smoking pot doesn’t make you gain weight. One study found that marijuana users’ waistlines are 1.5 inches smaller, an average. Pot is also correlated with: Lower body mass index, lower fat percentage, lower prevalence of diabetes, and a lower prevalence of obesity. That’s partially due to marijuana’s effect on your metabolism and insulin levels. Now, if you really want to curb the munchies pick your strain wisely. Indica strains are associated with body highs and increased appetite, while sativa strains have a more cerebral effect that can actually reduce appetite.