Cigarette smoking in Sydney schoolchildren aged 12 to 13 years.
D000293:Adolescent; D000367:Age Factors; D001249:Asthma / Q000453:epidemiology; D001315:Australia; D001991:Bronchitis / Q000453:epidemiology; D002648:Child; D005006:Ethnicity; D005260:Female; D006266:Health Education; D006801:Humans; D008297:Male; D009790:Occupations; D010290:Parents; D012123:Pulmonary Ventilation; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology* / Q000503:physiopathology; D000074606:Smoking Prevention; D014797:Vital Capacity