SHARE: If you smoke or vape in your car in the presence of others especially children you're exposing them to harmful secondhand smoke or aerosol. Cracking windows is NOT enough, Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Vaping Side Effects. Protecting Children's Health