CHILDREN who get into a car more than an hour after a parent has put out a cigarette still face a threat to their health, a study shows. Experts are warning parents that they are wrong to believe that opening car windows and stubbing out cigarettes before the children climb in will protect them. The study reveals that the amount of time it takes for dangerous particles in cigarette smoke to fall back to safe levels is longer than expected. And excessive exposure could put children at risk of breathing problems and lung disorders later in life. Tests show that in an average size car levels of potentially hazardous “particulate matter” remained high for more than an hour after a cigarette has been smoked.  More