A sign banning smoking “in the presence of infants and children including 12-year-olds, and of pregnant women” is displayed in a Naples, Italy, playground. Naples has taken its ban outdoors, forbidding smoking in public parks and during demonstrations and cultural events if children or pregnant women are nearby.

Tobacco kills up to half of those who use it, yet it is common worldwide. Because tobacco's health damage takes years or decades to manifest, the epidemic of related disease and death has yet to reach its peak. (© AP Images)