Public health messages have told us for decades that if you smoke, you should quit. And if you don’t smoke, don’t start. But a new study suggests smoking may be even worse than we thought. The study, ...

Quitting smoking often leads to weight gain due to a combination of decreased metabolism and increased eating. The metabolic boost from nicotine accounts for 31% of weight gain, while increased eating ...

Like other factors such as age, sex and genetics, smoking has a major impact on immune responses, according to a new study. In addition to its short-term impact on immunity, smoking also has long-term ...

Numerous factors shape how a person’s immune system reacts to infections and other challenges. Age, sex and genetics are fundamental contributors—as the COVID pandemic highlighted. Now a new study ...

A doctor explains the immediate and long-term effects a single cigarette can have on your body and why 'just one' may not be risk-free.