"Directly mimicking a natural neurotransmitter “teaches” your brain to want a drug—that’s how nicotine and heroin work. Crystal methamphetamine takes it to the next level: it imitates the reward chemical dopamine and the alertness chemical norepinephrine, causing your neurons to release more of both—all the while training your brain to want them more. What’s worse, the drug can damage dopamine- and norepinephrine-releasing neurons, which leads to a drastic decrease in their production, thereby making you crave more meth. It’s an addict’s nightmare and a marketer’s dream."
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