Substance use disorder (SUD) is a catch-all term for the diagnosable mental disorder based on 11 different criteria and classified on a spectrum. Different laws, employers, and recovery programs focus on alcohol, hallucinogens (such as LSD), opioids, stimulants (such as amphetamines, methamphetamines, and cocaine), cannabis, and tobacco. Identifying the issue as substance use disorder instead more specific disorders such as alcoholism or opioid use disorder helps highlight that people have naturally different levels of vulnerability to substances. Most people who struggle with substance use disorder have used different substances throughout their lives, so proper treatment involves understanding the bigger problem. Finally, some substances have more stigma than others, such as methamphetamine versus marijuana or alcohol.