Addictions are most commonly associated with drugs but can also broadly refer to engagement in any compulsive behavior resulting in possible harm. While addiction to drugs is the most common manifestation, addictions can also be associated with a range of activities including gambling, compulsive sex, videogames, or internet use.
The key feature of addictions is that engagement in a particular behaviour is compulsive and brings about a desired change in consciousness, yet proves problematic in the long term. Drugs, for example, have the most powerful effects, bringing about obvious physical, physiological or psychological changes in the body.