"[Tobacco smoking] has been a major health problem for many decades. For the entire 20th century it is estimated that around 100 million people died prematurely

"[Tobacco smoking] has been a major health problem for many decades. For the entire 20th century it is estimated that around 100 million people died prematurely because of smoking, most of them in rich countries." (https://ourworldindata.org/smoking https://ourworldindata.org/smoking)