In the United States, all 50 states and the District of Columbia have laws that prohibit smoking in cars with children present. The laws vary from state to state, but most of them prohibit smoking in cars with anyone under the age of 18 present. Some states also prohibit smoking in cars with anyone under the age of 16 or 14 present.
There are a few exceptions to these laws. For example, some states allow smoking in cars if the windows are rolled down or if the car is equipped with a ventilation system that removes smoke from the air. However, these exceptions are rare, so it is best to assume that smoking in a car with a minor present is illegal.
The penalties for smoking in a car with a minor present can vary from state to state. In most cases, the penalty is a fine, but some states also impose jail time.
In addition to the legal penalties, smoking in a car with a minor present can also have health consequences. Children who are exposed to secondhand smoke are at increased risk for a number of health problems, including asthma, bronchitis, and ear infections.
For these reasons, it is important to obey the laws and not smoke in a car with a minor present.