How does crack produce its effects?
Crack works on the automatic nervous system. The automatic nervous system controls the sympathetic system which speeds everything up such as heart rate and breathing. The autonomic nervous system also controls the para-sympathetic system which does the exact opposite (slows things down). This explains why people become hyper when the smoke crack. Crack works by causing the brains neuro transmitters to release all the dopamine at once (dopamine is a chemical in the brain which releases feelings of pleasure). When we laugh, a slight amount of dopamine is released and this makes you feel good. After this dopamine has been released, crack can block the re-uptake of the dopamine in some cases. If this happens, the person will now make it a mission to get any sort of pleasure.
