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Table 1 Adult population (15 years old or above) in surveyed and not surveyed countries in 2018

From: Estimation of the global number of e-cigarette users in 2020

  Surveyed population Not surveyed population
Count Percent Count Percent
World 2,749,362,376 48.59 2,909,456,112 51.41
WHO region     
 African region 22,676,140 3.68 593,557,990 96.32
 Eastern Mediterranean region 8,221,320 1.76 458,884,199 98.24
 European region 572,964,392 75.48 186,119,293 24.52
 Region of the Americas 596,683,633 76.73 180,998,282 23.27
 South-East Asia region 116,665,629 8.02 1,338,217,118 91.98
 Western Pacific region 1,432,151,262 90.60 148,518,994 9.40
World Bank income classification     
 High income 877,755,162 87.43 126,156,254 12.57
 Upper middle income 1,658,636,497 77.72 475,526,821 22.28
 Lower middle income 190,294,577 9.02 1,920,295,084 90.98
 Low income 22,676,140 5.53 387,286,693 94.47