Addiction is the use of any substance in increasing amounts without treatment purpose and without responding to a physiological need. Spending a lot of time to obtain, use or quit the substance; decreasing or abandoning social, professional and personal activities due to substance use; emergence of withdrawal symptoms when the substance is stopped or reduced; continuing to use the substance despite physical or psychological problems are among the basic elements of substance addiction. There are some stages of substance addiction. Although these stages are not the same for every substance addict, they are very important in terms of understanding substance users and making correct and appropriate interventions. In addition to various psychological stages, there are also some biological stages in people at risk of addiction. The first stage is a period when the person is not afraid of any substance they may use and the idea that they can use this substance develops. Later, the substance is tried for various reasons. After this, the substance is tried again and again for various reasons such as the desire to repeat the emotional fluctuation experienced or to relieve the psychological pain suffered. In these stages, the idea that they can control the substance used is often seen in people. After this, the substance is used very frequently and it starts to bring negativity to the person’s life. When the negativity in his/her life reaches more serious levels, attempts to quit the substance begin. Even if he/she can quit the substance for a while, he/she starts using it again and enters a vicious circle.
There are many substances with varying levels of addictive potential. Some of these substances are legal, while others are illegal. Alcohol, tobacco, marijuana, ecstasy, cocaine, heroin, morphine, LSD, ketamine, phencyclidine, and volatile substances are the main substances that can cause addiction.