title: Young mothers' decisions to use marijuana: a test of an expanded Theory of Planned Behaviour.
abstract: The current study examines the Theory of Planned Behaviour's (TPB) ability to predict marijuana use among young women who experienced a premarital pregnancy before the age of 18 years, using longitudinal data. The validity of the TPB assumption that all other variables work through TPB constructs is also tested. Indicators of four constructs that have been shown in the literature to be predictive of marijuana use-persistent environmental adversity, emotional distress, adolescent marijuana use and drug use in the social network-were tested as predictors of attitudes, norms and self-efficacy, in a structural equation modelling framework. All paths from distal predictors were through the mediating TPB constructs, in accordance with the tenets of the model. Implications of these findings for the TPB model and for understanding factors that lead to marijuana use are discussed.
authors.affiliation: School of Social Work, University of Washington, Seattle, WA 98105-6299, USA. dmm@u.washington.edu
authors.forename: Diane M
authors.initials: DM
authors.lastname: Morrison
authors.forename: Mary Jane
authors.initials: MJ
authors.lastname: Lohr
authors.forename: Blair A
authors.initials: BA
authors.lastname: Beadnell
authors.forename: Mary Rogers
authors.initials: MR
authors.lastname: Gillmore
authors.forename: Steven
authors.initials: S
authors.lastname: Lewis
authors.forename: Lewayne
authors.initials: L
authors.lastname: Gilchrist
mesh_terms: D000293:Adolescent; D003657:Decision Making; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008385:Marijuana Smoking / Q000523:psychology*; D017533:Marital Status; D009035:Mothers / Q000523:psychology*; D009042:Motivation; D011247:Pregnancy; D011582:Psychological Theory; D020377:Self Efficacy; D012931:Social Environment