As previously described in our analyses of environmental risk factors for cannabis abuse/dependence (Scherrer et al. 2008), data regarding parenting, early rearing environment and quality of relationships were obtained by the offspring's report to several questions based on Sarason and colleagues'(1991) constructs for perceived support in social relationships and from Robins and colleagues' (1985) scale for assessing early home environmental correlates of psychopathology. Offspring were asked separately about mothers' and fathers' strictness, rule consistency, closeness and pressure to perform well in school for when they were 6–13 years of age. Strictness was measured on a 5-point scale ranging from a lot more (compared to other parents) to a lot less strict. Due to the small number of subjects at the ends of the scale, we modeled strictness as a 3 level variable, a lot more/little more; same; a little less/a lot less. Rule consistency was measured with a binary response to the question, `Was your mother/father pretty consistent about rules or would she/he insist upon a rule one day and forget about it the next'? Closeness was measured on a
