The Effect of Smoking Behavior on Students’ Learning Discipline: A Study at SMA Negeri 2 Bitung. HEB [Internet]. 30 Desember 2025 [dikutip 22 Maret 2026];1(2):55-62. Tersedia pada: https://ejurnal.jurkeppolkesdo.my.id/index.php/HEB/article/view/69