Background: Tobacco combustion at high temperature in the form of a cigarette, pipe or cigar is a chemical process. All chemical compounds go into the smoker's body, as well as into the body of everyone who remains in the polluted environment. The aim of the research was to learn about smoking-related behavior at home among persons at the productive age who participated in the ‘Quit and Win' competition. Materials and Methods: The material is an element of a long-term study carried out on 1700 participants of the "Quit and Win" competition initiated in 1996. The subject of the analysis was the material obtained through a postal survey in August 2006. The completed questionnaire was returned by 648 people, which makes 38.1% of all the competition participants. Among the respondents, 521 people (80.4%) were at the productive age. Results: Of the 521 respondents, 389 persons (74.7%) claimed not to have been smoking at all for at least seven recent months and 132 people (25.3%) stated that they had failed to quit smoking. Of the 132 ever smokers 20 persons (15.1%) reported that they had smoked outside home and 112 people (84.9%) smoked in their homes. Conclusions: A vast majority of ever smokers at the productive who participated in the ‘Quit and Win' competition smoked at home, exposing the other household members to the danger of passive smoking. Med Pr 2009;60(2):125-129