Drug addiction includes abusing alcohol, cannabis, cocaine, heroin, opioid, painkillers, and nicotine, among others. Drugs like these help the person feel good about themselves and induce ‘dopamine’ or the happiness hormone. As they continue to use the drug, the brain starts to increase dopamine levels, and the person demands more. Drug addiction can start with experimental use of a recreational drug in social situations, and, for some people, the drug use becomes more frequent. For others, particularly with opioids, drug addiction begins with exposure to prescribed medications, or receiving medications from a friend or relative who has been prescribed the medication. The risk of addiction and how fast you become addicted varies by drug. Some drugs, such as opioid painkillers, have a higher risk and cause addiction more quickly than others.
As time passes, you may need larger doses of the drug to get high. Soon you may need the drug just to feel good. As your drug use increases, you may find that it's increasingly difficult to go without the drug. Attempts to stop drug use may cause intense cravings and make you feel physically ill.