Why does maintaining a consistent euphoria from heroin use require multiple administrations each day?
a) Withdrawal symptoms can arise within about 8 hours after the last dose
b) Tolerance develops, and the user must increase dosages to stay high.
c) The body's release of histamines clears the blood of heroin after 4 hours.
d) Low purity of street heroin requires users to administer the drug repeatedly to achieve euphoria.
A
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