Vaping Cannabis Produces Stronger Effects Than Smoking Cannabis For Infrequent Users Johns Hopkins Medicine Guidance for Secondhand Marijuana Smoke in Multi Unit Housing American Nonsmokers' Rights Foundation no smoke.org Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Secondhand vape exposure: Risks and side effects How a 14 year old boy became addicted to Spice through vapes