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According to the latest statistics from the World Health Organization, there has been a small but steady decrease in the estimated number of smokers globally since 2000 - from 1.14 billion then to about 1.1 billion now.

But it's a different matter when it comes to vaping. The number of vapers has been increasing rapidly - from about seven million in 2011 to 35 million in 2016.

Market research group Euromonitor estimates that the number of adults who vape will reach almost 55 million by 2021.