Natural cannabis contains over 60 different types of cannabinoid molecule. Delta-9-THC is recognised as a risk factor for the development of psychotic illness, cognitive impairment and is habit-forming. However other plant cannabinoids may have therapeutic properties. The molecule cannabidiol (CBD) appears to have anti-psychotic effects, and is regarded as an anxiolytic. Trials of CBD in psychiatric patients have been ongoing, leading to hope that CBD may translate for clinical use.