Secondhand marijuana smoke and kids Harvard Health Daily Dose Clearing the Haze: How to Discuss Marijuana and Vaping with Your Teen If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs. Secondhand smoke is harmful to those around you, putting them at risk for serious health issues. Protect your loved ones from the dangers of secondhand smoke by getting started with 802 Quits New Resources Available! Protect Public Health from Secondhand Smoke and Vaping Aerosols