Levels of Carbon Monoxide Expiratory Air on Shisha Users and the Factors Affecting. Jurnal Respirologi Indonesia, [S. l.], v. 39, n. 1, p. 37–43, 2019. DOI: 10.36497/jri.v39i1.38. Disponível em: http://jurnalrespirologi.org/index.php/jri/article/view/38. Acesso em: 10 jul. 2025.