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. 2021 Jul 19;23(7):e26510. doi: 10.2196/26510

Table 2.

Prevalence of themesa.

Themes Flavors Dual use Device features Youth use Health risks Switching Price Confusion Longevity Nicotine concentration
Nicotine concentration 10 (0.63) 1 (0.06) 17 (1.08) 16 (1.01) 4 (0.25) 2 (0.13) 4 (0.25) 0 (0.00) 1 (0.06) 42 (2.66)
Longevity 11 (0.70) 10 (0.63) 7 (0.44) 3 (0.19) 2 (0.13) 4 (0.25) 14 (0.89) 0 (0.00) 47 (2.98)
Confusion 10 (0.63) 0 (0.00) 3 (0.19) 2 (0.13) 2 (0.13) 0 (0.00) 0 (0.00) 49 (3.11)

Price 21 (1.33) 4 (0.25) 23 (1.46) 5 (0.32) 2 (0.13) 4 (0.25) 77 (4.88)


Switching 28 (1.78) 4 (0.25) 5 (0.32) 14 (0.89) 2 (0.13) 105 (6.66)



Health risks 13 (0.82) 6 (0.38) 9 (0.57) 17 (1.08) 130 (8.24)




Youth use 61 (3.87) 24 (1.52) 70 (4.44) 219 (13.89)





Device features 67 (4.25) 17 (1.08) 230 (14.58)






Dual use 31 (1.97) 254 (16.11)







Flavors 311 (19.72)








aThe diagonal line indicates the prevalence of the 10 topics identified. The off-diagonal lines indicate topic overlap. All values are presented as numbers and percentages in parentheses.