This page offers a comprehensive overview of why people use substances, covering the reasons behind alcohol and drug use and highlighting the risks of dependence and misuse. It categorizes and describes the most commonly used substances in Australia-such as alcohol, cannabis, cocaine, MDMA, opioids, inhalants, methamphetamines (ice), LSD, and medications-and addresses newer synthetic drugs, nicotine, and caffeine. The information is tailored for families and carers seeking to better understand different substances and support their loved ones.