CRP and nicotine dependence: The most commonly studied variables were SBP, DBP, and lifestyle, whereas the least frequently analyzed were c-reactive protein, which was studied only by 2 authors [13,14]; improvement in diet, studied by Choi et al [18] using the “Mediterranean diet score” and Widmer et al [19] using the “food score”; and nicotine dependence (by means of the Fagerström Test), analyzed only in the RCT by Fang et al [20].