- We asked ex-smokers to complete this sentence: "I quit smoking because..."
- Using the hashtag #WhyIQuit you responded in droves
Vital Signs is a monthly program bringing viewers health stories from around the world
(CNN)Globally, more than 1 billion people are estimated to smoke tobacco. Collectively, they smoked 5.8 trillion cigarettes in 2014, according to the 2015 Tobacco Atlas.