Based on the most recent national survey, almost 40% of the Australian population aged 14 years and over has used an illicit or illegal drug at least once in their life and nearly 17% has used at least once in the previous 12 months. This book looks at what the most used illicit drugs are, and explores the following issues: health risks, addiction and treatment; crime and punishment involving drug offences; and the impact of illicit drug use on families and society in general.