how long does a carton of cigarettes stay fresh study conducted by University College London reveals that smoking 20 can reduce an individual's lifespan by up to seven hours. On average, each cigarette shortens life expectancy by approximately 20 Do Cigarettes Expire? Shelf Life

Non-price factors such as governance status, weak regulatory framework, and the availability of informal distribution networks appear to be far more important factors." Dr Rob Branston, from the University of Bath's School of Management and Tobacco Control Research Group, also told the Mirror that this is a common assumption

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Upper-lobe predominance of emphysema was also more common in combined smokers, seen in 55% of them versus 32% in tobacco-only smokers (Pradre et al., 2026)