Smoking causes cancer, heart disease, stroke, lung diseases, diabetes, and chronic obstructive pulmonary disease (COPD), which includes emphysema and chronic bronchitis. Smoking also increases risk for tuberculosis, certain eye diseases, and problems of the immune system, including rheumatoid arthritis.

Nicotine enters your bloodstream, increasing your pulse and blood pressure. Your sense of smell is reduced. Because nicotine is a stimulant, your brain will release feel-good chemicals or make you want to eat. When you don’t satisfy the urge, you will feel anxious and irritable.

worst effects of smoking:

• Lung Cancer. More people die from lung cancer than any other type of cancer

• COPD (chronic obstructive pulmonary disease) COPD is an obstructive lung disease that makes it hard to breathe.

• Heart Disease

• Stroke

• Asthma

• Reproductive Effects in Women

• Premature, Low Birth-Weight Babies

• Diabetes.

Smoking effects start within a few hours and peak about 2 to 3 days later when most of the nicotine and its by-products are out of the body. Withdrawal symptoms can last a few days to up to several weeks. They get better every day that a person stays tobacco-free.

 Immediate effects of smoking

• initial stimulation, then reduction in the activity of the brain and nervous system.

• increased alertness and concentration.

• feelings of mild euphoria.

• feelings of relaxation.

• increased blood pressure and heart rate.

• decreased blood flow to fingers and toes.

• decreased skin temperature.

• bad breath.