According to the headline of a UPI news story from last week, vaping has been linked to an increased risk of having a heart attack. [...] It is irresponsible to use the results of this cross-sectional study to conclude (or even suggest) that e-cigarette use increases heart attack or stroke risk. Why? Because the study only assessed the relationship between "ever" having used e-cigarettes and "ever" having had a heart attack. [...]