He is a medical practitioner and tobacco treatment specialist working in private practice. He is actively involved in raising awareness of the public health benefits of nicotine-containing e-cigarettes and advocating for their legalisation in Australia. His activities in the smoking cessation field include teaching medical students and health professionals, writing, research, public education and consulting to the pharmaceutical industry. Colin is a member of the committee that develops the Australian national smoking cessation guidelines and is past Vice President of the Australian Association of Smoking Cessation Professionals. Colin is on the steering committee of the QUIT4october stop smoking campaign.