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Effects of cannabis smoking on the respiratory system: A state of the art review ScienceDirect Measuring PM2.5 concentrations from secondhand tobacco vs. marijuana smoke in 9 rooms of a detached 2 story house ScienceDirect What does smoking marijuana actually do to your lungs? Even if you say you don't smoke, your lungs may say otherwise. Dr. Ali Z. Jiwani explains what's really going on and Many Americans wrongly believe exposure to marijuana smoke is safer than tobacco, study finds CNN Secondhand Smoke Contra Costa Health

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