title: Drug use: association vs causation.
authors.forename: J
authors.initials: J
authors.lastname: Ryan
authors.forename: C
authors.initials: C
authors.lastname: Zwerling
authors.forename: M
authors.initials: M
authors.lastname: Jones
mesh_terms: D000041:Absenteeism; D000062:Accidents, Occupational / Q000191:economics / Q000517:prevention & control*; D003362:Cost-Benefit Analysis; D006801:Humans; D012307:Risk Factors; D015813:Substance Abuse Detection / Q000191:economics; D014947:Wounds and Injuries / Q000191:economics / Q000517:prevention & control*