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Lower grades, more absences for high schoolers who use both tobacco and cannabis Will Recreational Marijuana Cause an Increase in Lung Cancer? Hartford Hospital Hartford, CT Don't smoke it with tobacco: scientists suggest ways to make cannabis safer Cannabis The Guardian Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA Marijuana linked to heart disease; supplement may mitigate risk, study reports Many people think cannabis smoke is harmless. Here's how how that belief can put health at risk PBS News
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