The WHO estimates that tobacco caused 5.4 million deaths in 2004 and 100 million deaths over the course of the 20th century .
According to the World Health Organization ( WHO ) , tobacco is the single greatest cause of preventable death globally .
The WHO estimates that tobacco caused 5.4 million deaths in 2004 and 100 million deaths over the course of the 20th century .
According to the World Health Organization ( WHO ) , tobacco is the single greatest cause of preventable death globally .