揭秘:为什么戒烟那么困难
Why is smoking so difficult to give up? Inhaling a puff of smoke from a cigarette sends nicotine molecules zooming up into the brain within seconds. Then the nicotine grabs hold of receptors on brain cells and releases dopamine, the brain's feel-good chemical, bringing feelings of pleasure and comfort.
为什么戒烟如此困难?吸一口烟能在几秒钟内迅速将微小的尼古丁颗粒送进大脑。随后尼古丁控制了脑细胞受体，并释放出多巴胺——大脑中感觉良好的化学成分，能给人带来愉悦和舒适的感觉。
Besides dopamine, smoking also activates the release of other molecules in the brain that make you feel good, including chemicals called endogenous opioids, according to 2004 research from the University of Michigan.
除了多巴胺，吸烟还能促发大脑中使人感觉良好的其他微小颗粒的释放，包括被称为内源性类鸦片活性肽的化学分子，密歇根大学2004年的研究表明。