Breathing other people's smoke.
D002274:Carcinogens, Environmental; D005390:Fires; D005579:Fossil Fuels; D006801:Humans; D007223:Infant; D010290:Parents; D010947:Plants, Toxic; D012140:Respiratory Tract Diseases / Q000209:etiology; D012906:Smoke / Q000517:prevention & control*; D014026:Nicotiana
D002274:Carcinogens, Environmental; D005579:Fossil Fuels; D012906:Smoke