The annual campaign is an opportunity to raise awareness on the harmful and deadly effects of tobacco use and second-hand smoke exposure, and to discourage the use of tobacco in any form.

Every year, on 31 May, the World Health Organization (WHO) and global partners celebrate World No Tobacco Day (WNTD). The annual campaign is an opportunity to raise awareness on the harmful and deadly effects of tobacco use and second-hand smoke exposure, and to discourage the use of tobacco in any form.

How tobacco endangers the lung health of people worldwide

Lung cancer; Tobacco smoking is the primary cause for lung cancer, responsible for over two thirds of lung cancer deaths globally. Second-hand smoke exposure at home or in the work place also increases risk of lung cancer. Quitting smoking can reduce the risk of lung cancer: after 10 years of quitting smoking, risk of lung cancer falls to about half that of a smoker.

Chronic respiratory disease; Tobacco smoking is the leading cause of chronic obstructive pulmonary disease (COPD), a condition where the build-up of pus-filled mucus in the lungs results in a painful cough and agonising breathing difficulties. The risk of developing COPD is particularly high among individuals who start smoking at a young age, as tobacco smoke significantly slows lung development. Tobacco also  exacerbates asthma, which restricts activity and contributes to disability. Early smoking cessation is the most effective treatment for slowing the progression of COPD and improving asthma symptoms.

Across the life-course; Infants exposed in-utero to tobacco smoke toxins, through maternal smoking or maternal exposure to second-hand smoke, frequently experience reduced lung growth and function. Young children exposed to second-hand smoke are at risk of the onset and exacerbation of asthma, pneumonia and bronchitis, and frequent lower respiratory infections.

Globally, an estimated 60 000 children die before the age of 5 of lower respiratory infections caused by second-hand smoke. Those who live on into adulthood continue to suffer the health consequences of second-hand smoke exposure, as frequent lower respiratory infections in early childhood significantly increase risk of developing COPD in adulthood.

Tuberculosis; Tuberculosis (TB) damages the lungs and reduces lung function, which is further exacerbated by tobacco smoking. About one quarter of the world’s population has latent TB, placing them at risk of developing the active disease. People who smoke are twice as likely to fall ill with TB. Active TB, compounded by the damaging lung health effects of tobacco smoking, substantially increases risk of disability and death from respiratory failure.

Air pollution; Tobacco smoke is a very dangerous form of indoor air pollution: it contains over 7 000 chemicals, 69 of which are known to cause cancer. Though smoke may be invisible and odourless, it can linger in the air for up to five hours, putting those exposed at risk of lung cancer, chronic respiratory diseases, and reduced lung function. 

The most effective measure to improve lung health is to reduce tobacco use and second-hand smoke exposure. But knowledge among large sections of the general public, and particularly among smokers, on the implications for the health of people’s lungs from tobacco smoking and second-hand smoke exposure is low in some countries. Despite strong evidence of the harms of tobacco on lung health, the potential of tobacco control for improving lung health remains underestimated.

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