What is secondhand smoke (SHS)?
Most of us have heard people talking about secondhand smoke but few of us really understand what it is.
Secondhand smoke is smoke that is breathed in from other people's tobacco smoke. It is caused by smoke that is blown out when someone is smoking or it comes from the tip of the cigarette that has been left to burn.
Secondhand smoke contains more than 4,000 toxic chemicals.
When you smoke indoors your secondhand smoke lingers in the air. You can't see or smell it, but it's there.
The harmful chemicals creep from room to room for up to 5 hours, waiting for your child to breathe them in - even with the windows open and doors closed.
Find out more about secondhand smoke, including tips on making your home and car smokefree, via Take it right outside, the national campaign website.