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UofL study shows nicotine in e cigarettes may not be harmless, as some claim UofL News Is it dangerous to smoke a joint or use a bong? Poison Control Smoking marijuana may be more harmful to lungs than smoking cigarettes, study finds ABC7 Los Angeles Don't smoke it with tobacco: scientists suggest ways to make cannabis safer Cannabis The Guardian Casual Marijuana Smoking Not Harmful to Lungs Live Science What is a Spliff: What You Need to Know

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