I am interested in the causes, course, and consequences of substance use problems, particularly cannabis use. My current research projects involve (a) documenting the effects of cannabis use on cognitive function, mental health, and physical health, (b) investigating motives for, and consequences of, novel methods of cannabis use and novel cannabis preparations (e.g., cannabis concentrates), and (c) investigating how retinal imaging of microvessels can inform our understanding of the links between canabis use, neuropsychological function, and psychiatric problems (psychosis and depression).