title: Errors in analyzing associations between use of smokeless tobacco and cigarettes.
authors.forename: Scott L
authors.initials: SL
authors.lastname: Tomar
authors.forename: Michael
authors.initials: M
authors.lastname: Loree
mesh_terms: D000293:Adolescent; D000328:Adult; D015982:Bias; D004812:Epidemiologic Methods; D006801:Humans; D008297:Male; D012107:Research Design / Q000592:standards; D012907:Smoking / Q000523:psychology*; D016540:Smoking Cessation / Q000523:psychology; D014029:Tobacco Use Disorder / Q000209:etiology*; D014030:Tobacco, Smokeless