The most common substance use disorders are alcohol use disorder (AUD), tobacco use disorder, cannabis use disorder, stimulant use disorder, hallucinogen use disorder, and opioid use disorder.

Christopher Irizarry, Vice President of Primary Health Care Services at Banyan Health Systems, says most people do not see tobacco as a drug, but it is nicotine, and most kids think vaping is not harmful because it is not a cigarette, but it is addiction to nicotine. He also points out people taking opioids do not know the level of addiction they were facing, and they are taking opioids for pain, not understanding the addictive properties they have.