Imagine a new miracle drug with the potential to prevent one third of fatal cancers, to avoid one in four deaths from cardiovascular disease and to provide relief for six million Americans suffering from serious lung disease. The side effects of this hypothetical treatment appear to be minimal and people can carry on with normal life while under treatment. [...] It turns out that such a product exists, but it just isn’t a medicine. The product is the e-cigarette and millions of adults have already benefited by switching from smoking to vaping or are on their way to doing so. [...]