“… 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 Furthermore, users are increasingly creating their own device modifications, many of which pose an increased risk for elevated nicotine and carcinogen consumption and combustion. 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 …”