Production of lung carcinomas in C57BL mice exposed to a cigarette smoke and air mixture.

Group 1: Exposure to infection by one or more serologically non-overlapping influenza virus aerosols.Group 2: Exposure to an aerosol of 3:4-benzpyrene.Group 3: Exposure for life to a cigarette smoke and air mixture.Group 4: A combination of group 1 followed by group 2.Group 5: A combination of group 1 followed by group 3. Group 6: Exposure to aerosols of the aqueous suspending media for the virus or benzpyrene.