Shocking new figures have shown that more than 13,000 children in the North East need medical treatment every year as a result of breathing in second-hand cigarette smoke.
Experts say smoking out of a window or backdoor is not enough to protect children and that it's making them ill.
Donna Nicholson says she quit smoking because of the effects passive smoke could have on her children's health.
Fresh, the North East's regional office dedicated to tackling smoking, have welcomed the Government's latest campaign against passive smoking.
Director Ailsa Rutter said: "Smoking at the back door or winding down the window a little bit in your car just isn't enough to protect children from the really damaging effects of breathing in second-hand smoke.
"Eighty-five percent of second-hand smoke is invisible. It's odourless, it lingers for up to three hours and you really need very fast flowing air for it to come out of the car window."
New figures show that 13,000 children in the North East were admitted to hospital with smoking related problems last year.
The news comes as the Government launches its latest anti-smoking campaign warning people of the dangers of passive smoking.
TV and online adverts in England will outline the risk to children of people lighting up in cars and homes.