Chain-smoking is when you constantly or continually smoke cigarettes. You might finish one cigarette and then instantly light up another or be a frequent smoker with short breaks between each ...

New research uncovers how heavy smoking rapidly disrupts blood and airway biology, revealing the hidden damage that accelerates disease risk in otherwise healthy adults. Study: The effects of heavy ...

Human Y Chromosome Linked to Coronary Artery Disease Risk Individuals with genetic profiles putting them at risk of greater smoking are more likely to progress to heavy smoking and nicotine dependence ...

Researchers report that people under 50 who smoke have a higher risk of having an unexplained stroke. People who smoke heavily — 20 packs of cigarettes a year or more — have even higher stroke risks.