Passive smoking causes permanent damage to children's arteries which are staying in a smoky room and also causes to their blood cells for more than three years,the scientists say.
Enlargement of the walls of the blood vessels increases the risk of heart attack at later years,say scientists in the journal "European Heart ". The survey which covered more than two thousand children aged from three to 18 years concluded that extreme damage occurs if both parents are smokers.Experts say there is no safe level of secondhand smoke.
The survey was conducted in Finland and Austria and was focused on the physical effects of growing up in a home where there is smoke from cigarettes,although it is impossible to completely exclude other factors.
" Our study shows that exposure to secondhand smoke causes direct and irreversible damage to the structure of the arteries," said the study author Dr. Blue Gaulle.
She insisted that parents or those who think to become parents should quit smoking because that will not only improve their health,but will protect the health of their children too.