why do i feel weak after smoking a cigarette What Happens to Your Body When You Quit Cigarettes? 3 Months After Quitting Smoking:

The endotheliums vasodilatory activity is principally mediated by a free radical, which is nitric oxide (NO) (38)

Losing your sense of smell or having a change in your sense of smell is not going to directly cause you harm, but it can increase your risk of some potentially harmful things, such as: Food poisoning : When your sense of smell comes back wrong or is decreased long-term, it can put you at risk of experiencing food poisoning because you may not be able to tell when something in your fridge has gone bad

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This It also activates the reward system in the brain, releasing a feel-good chemical called dopamine