However, they pointed out that smoking cigarettes and vaping nicotine also cause lung injuries — but perhaps not to the same extent that vaping marijuana does. And those products are still associated with respiratory issues and an increased risk of cancer. "Without a doubt, cigarettes and e-cigarettes are unhealthy and not good for lungs. However, vaping marijuana appears even worse," study author Carol Boyd, co-director of the Center for the Study of Drugs, Alcohol, Smoking & Health at the University of Michigan, told CNN in an email. "Since many teens who vape nicotine, also vape cannabis, I recommend parents treat all vaping as a risky behavior (just like alcohol or drug use)."