There is no safe level of exposure to secondhand smoke.
In the U.S., secondhand smoke kills about 50,000 people each year. With no safe level of exposure to secondhand-smoke, studies correlate the act with sudden infant death syndrome (SIDS), low birth weight, respiratory and ear infections, and severe asthma attacks.
In non-smoking adults, exposure to secondhand smoke has been related to lung cancer and heart disease.
In an effort to reduce the harmful effects of secondhand smoke on children, a fine should be placed on all individuals who are found to be smoking in the presence of minors while driving motor vehicles.