Cocaine is a powerfully addictive central nervous system stimulant that can be smoked, injected, rubbed into the gums, or snorted. Crack cocaine is a cheaper form of cocaine that is mixed with ammonia or baking soda and water and then heated. Cocaine has a direct effect on the nervous system, increasing the available amounts of neurotransmitters dopamine, serotonin, norepinephrine, and glutamate, which leads to pleasurable sensations, changes in behavior,...