Main effect analyses showed no programme effects on incidences of alcohol consumption ( life-time prevalence : e-learning condition : B = 0.102 , P = 0.549 ; integral condition : B = -0.157 , P = 0.351 ; 1-month prevalence : e-learning condition : B = 0.191 , P = 0.288 ; integral condition : B = -0.140 , P = 0.445 ) , tobacco consumption ( life-time prevalence : e-learning condition : B = 0.164 , P = 0.444 ; integral condition : B = 0.160 , P = 0.119 ; 1-month prevalence : e-learning condition : B = 0.088 , P = 0.746 ; integral condition : B = 0.261 , P = 0.093 ) , or marijuana consumption ( life-time prevalence : e-learning condition : B = 0.070 , P = 0.732 ; integral condition : B = 0.186 , P = 0.214 ) .