The Nicotine–Parkinson’s Paradox

Nicotine is usually discussed as an addictive drug. But in 1959, researchers noticed something unexpected: people who smoked appeared less likely to develop Parkinson’s disease. That observation survived decades of scrutiny and eventually led to animal experiments, memory studies, nicotine patches, and major clinical trials. This investigation follows that evidence from the original anomaly to the latest human research to determine what nicotine actually does to the brain—and whether its neur...