Drug use patterns over the last decade have been characterised by the emergence of a huge number of new illicit drugs. These drugs include so-called ‘club drugs’ and ‘novel’ or ‘new’ psychoactive substances (NPS), although neither term fully captures the range and complexity of the substances or the ways that they are used. There is also significant overlap between different drugs, but Figure 2.1 demonstrates how they can be considered as established drugs, established club drugs and NPS.