“…Twenty-six studies compared biomarkers of inflammation between daily e-cigarette users and non-smokers and/or smokers ( 47 , 50 – 53 , 56 – 58 , 60 , 62 – 65 , 89 – 100 , 103 ). Most of these studies were related to oral health ( n = 14) ( 53 , 62 , 63 , 65 , 89 – 94 , 97 , 103 ), followed by respiratory health ( n = 7) ( 57 , 58 , 95 , 96 , 98 – 100 ), CV health ( n = 4) ( 47 , 50 – 52 ), and a single study with biomarkers of inflammation non-specific to a physiological system ( 56 ). Only four studies reported on exclusive e-cigarette use ( 65 , 98 , 99 , 103 ).…”