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Many people think cannabis smoke is harmless a physician explains how that belief can put people at risk Are There Risks From Secondhand Marijuana Smoke? Early Science Says Yes Houston Public Media Smoking pot vs. tobacco: What science says about lighting up FOX 9 Minneapolis St. Paul Smoking Marijuana Vs. Tobacco: What Science Says About Lighting Up They compared weed, tobacco and non smoker's lungs Tobacco vs. Weed: Similarities and Differences
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