Hello, I'm an expert in public health with a focus on the impact of lifestyle choices on health outcomes. One of the most well-documented effects of smoking on health is its impact on life expectancy.

The average life expectancy of a smoker is significantly lower than that of a non-smoker. According to various studies, smoking can reduce life expectancy by anywhere from 10 to 15 years on average. This reduction is due to the increased risk of developing smoking-related diseases such as lung cancer, heart disease, stroke, and chronic obstructive pulmonary disease (COPD), among others.

However, it's important to note that life expectancy can vary widely depending on several factors, including the intensity and duration of smoking, the presence of other health conditions, and access to healthcare. For example, a person who smokes heavily for many years is likely to have a shorter life expectancy than someone who smokes less or for a shorter period.

Moreover, quitting smoking can have a profound effect on life expectancy. Even those who have smoked for many years can significantly reduce their risk of smoking-related diseases and increase their life expectancy by quitting.

In conclusion, while it's difficult to pinpoint an exact number for the average life expectancy of a smoker without considering individual factors, it's clear that smoking has a substantial negative impact on health and longevity.

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Cigarette smoking causes premature death: Life expectancy for smokers is at least 10 years shorter than for nonsmokers. Quitting smoking before the age of 40 reduces the risk of dying from smoking-related disease by about 90%.read more >>