The difference in exposure to secondhand smoke/aerosol indoors and outdoors is that indoors, the concentration of the harmful chemicals, compounds and particles released from the product or exhaled by the smoker/vaper can build up and/or stay in the enclosed space for a longer period of time, meaning that people near the smoker/vaper indoors can be exposed to higher concentrations of pollutants for a longer time.
Regardless of where the exposure occurs—outdoors or indoors—second-hand exposure can pose health risks or worsen existing health symptoms for some people.
Read more about Used smoke/aerosol.
