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Mythbusters: Cannabis 20 times more carcinogenic than tobacco? NZ Drug Foundation Effects of cannabis smoking on the respiratory system: A state of the art review ScienceDirect Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Smokers lungs: Weed, tobacco, and non smokers Marijuana and Lung Cancer: Myth or Fact? The Impact of Dual Cannabis and Tobacco Smoking in Young Patients With Lung Cancer: Results From the Prospective Environment and Lung Cancer Study ScienceDirect
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