Physician use of marijuana, alcohol, and tobacco.
D000328:Adult; D000367:Age Factors; D000428:Alcohol Drinking; D001290:Attitude; D002188:Cannabis; D006266:Health Education; D006801:Humans; D007880:Legislation, Drug; D008875:Middle Aged; D010820:Physicians; D010947:Plants, Toxic; D012111:Residence Characteristics; D012494:Sampling Studies; D012907:Smoking / Q000453:epidemiology*; D012919:Social Behavior; D013337:Students, Medical; D019966:Substance-Related Disorders / Q000453:epidemiology*; D011795:Surveys and Questionnaires; D014026:Nicotiana; D014481:United States