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When it does, it triggers the release of dopamine, GABA, glutamate, acetylcholine, and noradrenaline

"By stimulating the brain to release dopamine, if it's done over a period of time, it changes the way the brain responds to rewarding things," he said

At the end of the process, the tobaccos are almost black or dark brown in color

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But users who actually go through these devices usually notice: Puff count is based on very short lab-style puffs (around 11.5 seconds) Real-life puffs are often longer and stronger Battery life / coil efficiency can reduce usable puffs So that 9000 is more like a best-case scenario number , not a guaranteed count