Heroin passes the
blood-brain barrier almost immediately after it is sniffed or injected
in to the body. Once it is in the brain, it is turned in to morphine,
which is then linked with the opioid receptors immediately. Usually the
users describe a rush of enjoyable and delightful sensation.
How
powerful the rush is depends upon the quantity of drug and how fast it
enters the brain and links with the natural opioid receptors in it.
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