Dopamine is a drug for example, so I would suggest around 7 Billion.

Posted By: Steve in Holland, Jan 30, 10:28:39

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Illegal ones
Posted By: Charles21, Jan 30, 10:33:13
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As are caffeine, nicotine, and alcohol. So just about everyone I'd say.
Posted By: tudders, Jan 30, 10:31:59

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