According to a study led by the WHO, passive smoking causes 600,000 deaths every year.

(One-third of those killed are children, often exposed to smoke at home or in the family car. The study, carried out in 192 countries, found that passive smoking is particularly dangerous for children, said to be at higher risk of sudden infant death syndrome, pneumonia and asthma. And yet people still smoke. Especially outside the school gates as they pick up their children. We are a funny species.)