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Smoking marijuana may be more harmful to lungs than smoking cigarettes, study finds ABC7 Los Angeles Updated Cannabis Fact Sheet Available American Nonsmokers' Rights Foundation Young people 'see cannabis as safer than alcohol' Measuring PM2.5 concentrations from secondhand tobacco vs. marijuana smoke in 9 rooms of a detached 2 story house ScienceDirect They compared weed, tobacco and non smoker's lungs Marijuana may be even safer than previously thought, researchers say The Washington Post

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