: Nicotine narrows blood vessels and increases heart rate, significantly raising the risk of heart attacks and strokes.

: The habit affects everything from oral health—causing stained teeth and gum disease—to bone density, increasing the risk of osteoporosis.

: Smoking is responsible for approximately 85% of lung cancer cases, and smokers are 15 to 20 times more likely to die from lung disease than non-smokers. It also exacerbates conditions like asthma and can lead to chronic obstructive pulmonary disease (COPD).