['To understand clinician influence on use of home and automobile smoking bans in homes of children living with a smoker.', 'Parents were surveyed on tobacco use, smoking bans, demographics and opinions about tobacco, including harm from environmental tobacco smoke (ETS). Responses from 463 diverse households with smokers were analyzed.', "42% of respondents smoked; 50% had a home smoking ban and 58% an automobile smoking ban. Nonsmokers living with a smoker, those who strongly agreed in ETS harm, and those having a child < or = 5 years more often had a home smoking ban. Those recalling their child's doctor ever asking the respondent about their smoking status and African American respondents less frequently had a home ban. Automobile smoking bans were more often held by those with strong agreement in ETS harm and less often found in families having a child receiving Medicaid/uninsured."] Does influences on parents ' decisions for home and automobile smoking ban in households with smokers?