| ITC | International Tobacco Control Survey |
| GATS | Global Adult Tobacco Survey |
| LMIC | Low- and middle-income county |
| HIC | High-income country |
| CHD | Coronary heart disease |
| COPD | Chronic obstructive pulmonary disease |
| TB | Tuberculosis |
| WHO | World Health Organization |
| Illit. | Illiterate |
| NR | Income not reported |
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