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How Cigarettes Cause Disease
Cigarette smoke contains more than 7,000 chemicals, including at least 70 known carcinogens. When inhaled, these chemicals damage cells throughout the body — particularly in the lungs, airways, blood vessels, and heart. The tobacco industry has known since the 1950s that their products cause serious disease, yet they deliberately concealed these facts and engineered cigarettes to maximize nicotine addiction.
Cancers Caused by Cigarette Smoking
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Lung Cancer — By far the most common smoking-caused cancer. Approximately 80-90% of all lung cancer deaths are linked to cigarette smoking. Smokers are 15 to 30 times more likely to develop lung cancer than non-smokers.
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Mouth, Throat, Larynx & Sinus Cancers — Cancers of the oral cavity, pharynx (throat), larynx (voice box), and nasal passages/sinuses are directly caused by cigarette smoke exposure.
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Esophageal Cancer — Smoking significantly increases the risk of cancer of the esophagus, the tube connecting the throat to the stomach.
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Bladder, Kidney & Ureter Cancer — Carcinogens in cigarette smoke are filtered through the urinary system, causing cancers of the bladder, kidneys, and ureters.
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Pancreatic, Stomach & Liver Cancer — Smoking is a major risk factor for pancreatic cancer, gastric (stomach) cancer, and liver cancer.
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Colorectal Cancer — Cigarette smoking increases the risk of colon and rectal cancer.
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Cervical Cancer — Smoking is a known risk factor for cervical cancer in women.
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Acute Myeloid Leukemia (AML) — Chemicals in cigarette smoke damage the bone marrow and are linked to this aggressive blood cancer.
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Prostate & Ovarian Cancer — Smoking is associated with increased risk and worse outcomes for certain prostate cancers and ovarian cancers.
Heart, Lung & Vascular Diseases
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COPD (Chronic Obstructive Pulmonary Disease) — The leading cause of COPD, which includes emphysema and chronic bronchitis. COPD progressively destroys the ability to breathe and is the fourth leading cause of death in the U.S.
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Coronary Heart Disease & Heart Attacks — Smoking damages blood vessels, raises blood pressure, and accelerates plaque buildup in arteries. Smokers are 2 to 4 times more likely to develop heart disease.
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Stroke — Smoking doubles the risk of stroke by damaging blood vessels and promoting blood clots in the brain.
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Peripheral Arterial Disease (PAD) — Smoking narrows the blood vessels in the legs and arms, reducing blood flow and potentially leading to amputation.
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Abdominal Aortic Aneurysm — Smoking weakens the wall of the aorta, the body's largest artery, which can lead to a life-threatening rupture.
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Atherosclerosis — Smoking accelerates the narrowing and hardening of arteries throughout the body, increasing the risk of heart attack, stroke, and vascular disease.
Other Serious Conditions
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Type 2 Diabetes — Smokers have a 30-40% higher risk of developing type 2 diabetes, and smoking makes blood sugar control significantly more difficult.
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Rheumatoid Arthritis & Immune Disorders — Smoking triggers and worsens autoimmune conditions, including rheumatoid arthritis and other immune system problems.
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Eye Diseases — Smoking causes cataracts and age-related macular degeneration (AMD), leading to vision loss or blindness.
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Reproductive & Pregnancy Issues — Smoking causes reduced fertility and erectile dysfunction in men, and in women can lead to ectopic pregnancy, miscarriage, and preterm birth. Babies of smoking mothers face increased risk of low birth weight, orofacial clefts (cleft lip/palate), and sudden infant death syndrome (SIDS).
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Periodontal (Gum) Disease & Tooth Loss — Smoking is a leading cause of severe gum disease, which can result in tooth loss and bone deterioration in the jaw.
The Tobacco Industry Knew
Internal tobacco company documents — released through landmark litigation — prove that manufacturers like Philip Morris, RJ Reynolds, and Lorillard knew their products were deadly and addictive, yet publicly denied these facts for decades. They manipulated nicotine levels to keep smokers hooked and targeted young people with carefully designed advertising campaigns.
