To add some context: There was a review of a study very similar to this one last year that the cardiovascular stress levels achieved when using nicotine (a mild stimulant) were the within the range of other activities such as consuming a caffeinated beverage; moderate exercise; watching an action / horror movie; listening to certain types of music (rock / metal, for instance); etc. In short, this "study" and the press release parroted by the corporate media provides no information that could not otherwise be deduced with some critical thinking.