Obesity and smoking habits by social class.
D000328:Adult; D000367:Age Factors; D001827:Body Height; D001835:Body Weight; D001991:Bronchitis / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology*; D010947:Plants, Toxic; D012907:Smoking / Q000453:epidemiology*; D012923:Social Class; D014026:Nicotiana