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In page Discrimination against drug addicts:

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There are several terms related to addiction that are not stages of addiction per se. Tolerance means the need to take more of a substance to achieve the desired effect when compared to before. It does not matter what the desired effect is (pain control/focus/euphoria/etc.). Tolerance to opioids can develop rapidly. Tolerance may occur in addiction but also occurs in those who are prescribed certain medications who may not meet DSM-V-TR criteria for a Substance Use Disorder. Tolerance quickly develops to the effects of hallucinogens after a few administrations, which is part of the reason why addiction to this class of substances is rare.[citation needed]