When you inhale smoke, nicotine is carried deep into your lungs. There it’s quickly absorbed into the bloodstream and carried throughout your body. In fact, nicotine inhaled in cigarette smoke reaches the brain faster than drugs that enter the body through a vein (intravenously or IV).
Nicotine affects many parts of your body, including your heart and blood vessels, your hormones, the way your body uses food (your metabolism), and your brain. Nicotine can be found in breast milk and even in the cervical mucus of a female smoker. During pregnancy, nicotine crosses the placenta and has been found in amniotic fluid and the umbilical cord blood of newborn infants.
Different factors affect how long it takes the body to remove nicotine and its by-products. In most cases, regular smokers will still have nicotine or its by-products, such as cotinine, in their bodies for about 3 to 4 days after stopping.
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