The straightforward answer is no, cigarettes do not expire in the traditional sense
Worldwide, the number of people who smoke has decreased since 2006, a positive trend attributable to several factors, including cigarette price increases, antismoking laws, and societal disapproval (Ng et al., 2014
Simply put, health policies should aim to prevent young people from smoking and should clearly communicate the benefits of quitting to those who do smoke, ideally as young as possible, and before the onset of serious illness. This study adds to the body of evidence that starting to smoke at younger ages can significantly increase the risk of death from cardiovascular disease
Tiny pollution particles in smoke can be ten times smaller than the width of a human hair, so small they can cross into peoples bloodstream once inhaled