Brain (Become Addicted)
Nicotine from cigarettes is as addictive as heroin. Nicotine addiction is hard to beat because it changes your brain. The brain develops extra nicotine receptors to accommodate the large doses of nicotine from tobacco. When the brain stops getting the nicotine it’s used to, the result is nicotine withdrawal. You may feel anxious, irritable, and have strong cravings for nicotine.
Hearing loss. Smoking reduces the oxygen supply to the cochlea, a snail-shaped organ in the inner ear. This may result in permanent damage to the cochlea and mild to moderate hearing loss.
Blindness and night vision. Smoking causes physical changes in the eyes that can threaten your eyesight. Nicotine from cigarettes restricts the production of a chemical necessary for you to be able to see at night. Also, smoking increases your risk of developing cataracts and macular degeneration (both can lead to blindness).
Cavities. Smoking takes a toll on your mouth. Smokers have more oral health problems than non-smokers, like mouth sores, ulcers and gum disease. You are more likely to have cavities and lose your teeth at a younger age. You are also more likely to get cancers of the mouth and throat.
Smoker’s face. Smoking can cause your skin to be dry and lose elasticity, leading to wrinkles and stretch marks. Your skin tone may become dull and grayish. By your early 30s, wrinkles can begin to appear around your mouth and eyes, adding years to your face.
Smoking raises your blood pressure and puts stress on your heart. Over time, stress on the heart can weaken it, making it less able to pump blood to other parts of your body. Carbon monoxide from inhaled cigarette smoke also contributes to a lack of oxygen, making the heart work even harder. This increases the risk of heart disease, including heart attacks.
Your body is made up of cells that contain genetic material, or DNA, that acts as an “instruction manual” for cell growth and function. Every single puff of a cigarette causes damages to your DNA. When DNA is damaged, the “instruction manual” gets messed up, and the cell can begin growing out of control and create a cancer tumor. Your body tries to repair the damage that smoking does to your DNA, but over time, smoking can wear down this repair system and lead to cancer (like lung cancer). One-third of all cancer deaths are caused by tobacco.
Muscle deterioration. When you smoke, less blood and oxygen flow to your muscles, making it harder to build muscle. The lack of oxygen also makes muscles tire more easily. Smokers have more muscle aches and pains than non-smokers.