Background: Tobacco smoking is incomparable the most unhealthy product legally available and is individual the largest cause to sickness, suffering and heath in the west world. Passive smoking can cause the same health problems as active smoking does. Children are more vulnerable to tobacco smoke because there high respiratory rate. Small children's immune system is in development, the tobacco smoke can affect this process and increases the risk for allergy. Passive smoking can also increase the risk for respiratory and ear infections and developing in a higher extent asthma. It is important part of the Child Health Care Nurse (CHCN) work to speak about passive smoking to parents. The purpose of this study was to illuminate the CHCN experience of health work focusing on passive smoking to parents who smokes. Method: In this interview study a qualitative content analysis with inductive approach was conducted. CHCN who worked in health care and family care centers in north/ northwest of Sweden, was asked to participate. Nine CHCN were interviewed. The interviews were performed with semi-structured questions. Results: The analysis present that CHCN give information about how passive smoking can affect small children. CHCNs give equivalent information concerning tobacco smoke deleterious effect to the smoking parent's irrespective of culture, ethnicity and socio-economic belonging. The CHCNs also described that it could be difficult to give information to the parent's and at the same time not cause feelings as guilt and shame. None of the CHCN offered a stop smoking conversation to the parents who wanted to quit smoking. Instead they mediated contact to a smoke-weaning nurse. Concussion: All the CHCNs gave information about passive smoking and it´s negative affect on children. The CHCN described that it could be difficult sometimes to give information and at the same time not aggrieve the parents.