Nicotine

Nicotine withdrawal symptoms are temporary and resolve within the 2-to-6-week receptor recovery window. Nicotine is more addictive than cocaine or heroin. Nicotine is among the most addictive substances known to science. Sugar activates brain reward circuitry 20 times faster than nicotine, making processed foods potentially more addictive. There is no safe dose of tobacco; any level of exposure carries health risk. Prior public health messaging understated tobacco's harm by framing it as affecting only "almost every" organ. Nicotine acts as a stimulant in the brain. Nicotine causes temporary vasodilation in the lungs, creating a false sense of easier breathing immediately after smoking. Nicotine is fully depleted from the body at 72 hours after quitting. Excessive nicotine consumption can cause runaway excitability in the central nervous system. Nicotine can stimulate angiogenesis through receptors on blood vessel cells. Nicotine from a cigarette reaches the brain's reward circuitry in approximately 12 seconds. Nicotine stimulates adrenaline release causing bronchodilation in the lungs, which is why smokers often feel they can breathe better when smoking. Nicotine clears from the…