This project aims to explore the impact of changes in the laws applying to cannabis in WA on a sample of regular cannabis users in terms of both their use of the drug, and indicators of the drug market for cannabis in WA including: price; perceived potency; availability; source (user-growers v large scale criminal suppliers etc.); and sale of hydroponic equipment. It iinvolves the collection and analysis of qualitative and quantitative interview data from a sample of regular (weekly or more frequent) cannabis users. Based on data from phase 1 of the present study we can expect that roughly 7 in 10 of those recruited would be daily cannabis users (Chanteloup, Lenton, Barratt et al., 2005; Chanteloup, Lenton, Fetherston et al., 2005). The study will comprise the second (post) wave of data collection being conducted some 36-42 months after the introduction of legislative change for cannabis in WA. As at the pre change wave, the post-change wave the sample will consist of 100 adult cannabis users (who have used the drug at least once a week over the previous 3 months. In the post- phase, the quantitative and qualitative interviews will include questions about: their use of cannabis (frequency, situational factors, functionality, mode of administration, etc.) and other drugs; drug use history; cannabis use and driving, prior involvement with the law; knowledge and attitudes towards the law, impact of the CIN scheme on their acquisition and use of cannabis and the cannabis market in general.