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A new study examining the relationship between vaping and smoking finds that cigarette smoking dramatically decreased between 2013 and 2017, just as e-cigarette use became more popular.

The study, published in the journal Tobacco Control, looked at five different US surveys that covered the four year time frame.

The study’s senior author, David Levy, said: ‘We found a strong and consistent inverse relationship between vaping and smoking across the different datasets for both youth and young adults.’