Sometimes, substance misuse is divided into four stages. A person will often start with experimentation, meaning they will try the drug once or twice to see how they feel about it. Then, if they like it, they will begin using it regularly. When regular use is not enough, a person will progress to the third stage, risky use, which involves more frequent use and damage to a person’s health and life. The fourth and final stage is drug addiction, in which a person cannot stop doing the drug without help from outside sources.