Americans spend a great deal of time in cars, and if someone smokes there, the poisons can build up quickly. Again, this can be especially harmful to children.
In response to this fact, the US Environmental Protection Agency has been working to encourage people to make their cars, as well as their homes, smoke-free. Some states and cities even have laws that ban smoking in the car if carrying passengers under a certain age or weight. And many facilities such as city buildings, malls, schools, colleges, and hospitals ban smoking on their grounds, including their parking lots.