Studies of caffeine consumption in mice have shown a marked increase in seritonin production, and commensurate decrease in seratonin reuptake, if combined with nicotine inhalation at the same time.
http://www.ncbi.nlm.nih.gov/pubmed/5531800845
The mice are happier when they are allowed to have a fag with their morning espresso. Particularly the mice from France.
@NotThamesWater started
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Studies of caffeine consumption in mice have shown a marked increase in seritonin production, and commensurate decrease in seratonin reuptake, if combined with nicotine inhalation at the same time.
http://www.ncbi.nlm.nih.gov/pubmed/5531800845