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Benzodiazepines increase the efficiency of GABA, a neurotransmitter that inhibits activity in the brain to produce a feeling of sedation and calm
"Nicotine content of electronic cigarettes, its release in vapour and its consistency across batches: regulatory implications" (PDF)

And although committed to the beauty and strength of Norway, Gaia, Erika, young revolutionaries, and the Earth, he also makes it clear, with a playful Buddhist detachment reminiscent of Gary Snyder, that Saving the world was only a hobby (169)

Now onto why you should buy disposable e-cigarettes
Cancer 105 , 249254 (2003)