This is a New England Journal Article re: smoking cessation, weight gain, and health. https://www.nejm.org/doi/10.1056/NEJMoa1803626 Yes. Stopping smoking tends to make you gain weight. And yes, the weight gain even increases the risk for diabetes. But the smoking cessation has twice the impact on your health as weight gain and diabetes. There's no question - STOP SMOKING! if you want to be healthy. The "ill quitter" effect is the known research confusion caused by people that stop smoking due to cancer or lung disease. It was studied and shown to have some impact. But attempts to remove this impact were challenging.
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