"How does nicotine affect your body?
There are so many dangers associated with using tobacco products that sometimes the harmful effects of nicotine alone get lost in the shuffle. Nicotine adversely affects EVERY major system in the human body. As it builds up from regular use, it can lead to weakened immune function, fatigue, decreased healing time, and long-term diseases including cancer. In fact, nicotine prevents the body from properly disposing of damaged cells, thereby allowing cancer cells to develop. beige or ivory color wears for bridesmaid

Whether nicotine comes from smoke, chew, or use of newer e-cigarettes or dissolvable tobacco, nicotine affects each user in the same ways. Let’s break down the body and see how nicotine impacts individual parts:
Brain: Nicotine disrupts normal neurotransmitter activity, causing chemical changes and addiction. Other neurological symptoms caused by nicotine include light-headedness, sleep disturbance, dizziness, and tremors.
Heart and Arteries: Nicotine increases heart rate and raises blood pressure when it stimulates the release of adrenaline. Short term, this means your body is less efficient when you exercise. It has to work harder getting the blood and oxygen to cells that need it, preventing the body from reaching its maximum potential. Long term, the stress on the heart and arteries can lead to increased risk of heart attack and can even lead to a stroke and/or aneurysm.
Eyes: Nicotine reduces the ability to see at night by stopping the production of pigments in the eyes specially designed for low-light vision. Adrenaline released by nicotine reduces peripheral vision, and in the end, nicotine accelerates the degeneration of the eyes.
Metabolism: Nicotine increases calories burned but decreases endurance by wasting energy in the effort. So, while nicotine users may have the energy to sprint down the block, they won't have the maximum lung or heart capacity to get their best score on a PT running test or maybe even to finish the all-night trek with their unit.
Reproductive System: Nicotine prohibits proper blood circulation and is a leading cause of erectile dysfunction (impotence) for men under 40. Nicotine also increases the risk of infertility and miscarriage. And if babies exposed to nicotine in utero do make it to birth, they tend to have low birth weights, be born prematurely, and have increased risk for lung problems.
Bones: When used over time, nicotine alters cellular structures and has been found to increase risk for fractures while contributing long-term to the development of weakened bones (osteoporosis).
Smokers are at an additional risk because nicotine is present in their lungs. Nicotine causes rapid and shallow respiration, leading to quicker fatigue during exercise or combat. Over time, nicotine permanently damages the cells in the lungs by changing their structure. This leads to increased risk for lung disease, lung cancer, emphysema, pneumonia, and bronchitis!"
This is some of the info out there on the harmfulness of Nicotine on the body & brain