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By Genevra Pittman NEW YORK (Reuters Health) - People who had used marijuana in the past month had smaller waists and lower levels of insulin resistance - a diabetes precursor - than those who never tried the drug, in a new study. The findings, based on surveys and blood tests of about 4,700 U.S. adults, aren't enough to prove marijuana keeps users thin or wards off disease. And among current pot smokers, higher amounts of marijuana use weren't linked to any added health benefits, researchers reported in The American Journal of Medicine. "These are preliminary findings," said Dr. ...