It's called tolerance, or habituation.
tolerance
tolerance
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Drug addicts require higher doses of the drug to which they are addicted because they develop tolerance for the drug.
Drug tolerance is the ability to withstand increasing amounts of a drug without reacting to it
Physical dependence occurs when a person develops a tolerance to the effects of a drug and needs larger and larger doses to achieve intoxication or another desired effect.
There is a center called the drug help that will help you with your drug consueling needs. This program is through the government and fees are paid with a sliding scale.
When a person needs a drug to feel normal, he or she has an addiction.
A psychological dependence is a person's belief that he or she needs a drug to feel good or to function normally. A physical dependence is a condition where a person has a physical or chemical dependence on the drug.
Physiological dependence = result of constant use of a drug to the point whereby the body's normal state is the drugged state, i.e. the drug is needed in order to feel normal. Physiological dependence develops with the gradual increase in the body's tolerance to the drug. Tolerance means that more and more of the drug is needed to get the desired effect. Without this increase, the drug user can actually suffer from withdrawal symptoms. Physiological dependence called chemical dependence.Psychological dependence = a drug user's tendency to change his life because of the drug and to centre his/her activities around the drug (acquiring it, using it, experiencing it).
Drug tolerant
It's called "building up a tolerance" to a drug. Users who take a drug all day every day become so accustomed to being on the drug, that they actually feel normal when they're on it, and they feel distinctly abnormal when they stop. They have to take massive amounts of the drug to get a high. Taking smaller amounts only feeds their craving and keeps them feeling normal.