Habit - it is done by choice. The person with the habit can choose to stop, and will subsequently stop successfully if they want to. The psychological/physical component is not an issue as it is with an addiction.
When a person is addicted to something they cannot control and become dependent on it to cope with daily life.
It is DEPENDENCY which often leads to tolerance in that the need increases and the amount of stimulus needed increases to get the same effect.
Addiction used to be thought of as a psycho-active substance that crosses the blood-brain barrier, temporarily altering the chemical balance of the brain. Psychological dependency with things such as gambling, sex, internet, work, exercise, etc. should also be counted as addictions, because they can also lead to a variety of feelings such as guilt and shame, hopelessness and despair, failure and rejection, anxiety and humiliation.
Addiction, often referred to as dependency often leads to tolerance - needing larger and more regular amounts of stimulus to receive the same effect.
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