According to the National Institute on Drug Abuse (NIDA), in the USA there are 47 million smokers, 8.2 million alcoholics, and 3.5 million illicit drug users. All three types of drugs stimulate production of dopamine in the pleasure centers of the brain. Levels of serotonin, GABA, and norepinephrine may also be increased. (Greenwood-Robinson, Maggie, PhD. 20/20 Thinking. NY: Avery, Putnam Special Markets, 2003, pp 287-290)

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