According to modern research only 17% of the people who smoke marijuana are over weight. According to the research both tetrahydrocannabinol and cannabinoids are needed for this weight regulation. Marijuana does not cause you to loose weight, it causes your weight to regulate.
That means we would have less fat people in this world if marijuana was legal. Just like people drink a glass of marijuana per day for their health, people would be able to smoke a little bit of marijuana each day for their health.
The marijuana has been shown in modern research to reduce diabetes along with promoting weight regulation. Legalizing weed would be saving lives. Prohibition kills.