Fig. 3From: Changes in cannabis use, exposure, and health perceptions following legalization of adult recreational cannabis use in California: a prospective observational studyMean perceptions over time. Perceptions of mental health, physical health, and wellbeing of cannabis use increased over time. Possible responses for each scale ranged from extremely harmful (− 4) to neither harmful nor beneficial (0) to extremely beneficial (+ 4), with values and anchors of less degree of harm/benefit in betweenBack to article page