The study used a longitudinal design, following approximately 32,000 adults over a six-year period from 2013 to 2019. E-cigarette use and tobacco cigarette use were assessed periodically, as was self-reported heart disease, including a heart attack, heart failure, or stroke. Public health organizations should be ecstatic about the results of this research. It is ground-breaking research because it provides the first longitudinal assessment of heart disease risk that compares smokers and exclusive vapers. The finding of a 34% decline in heart disease risk among vapers is a game changer. [...]