Marpaung RF, Pinondang Hotria Siregar. The Relationship Of Knowledge About The Hazards Of Smoking With Smoking Behavior In The Teenns In Nagori Gajing Jaya Kab. Simalungun In 2021. midwifery [Internet]. 2021 Oct. 30 [cited 2026 Apr. 30];10(1, October):643-6. Available from: https://www.midwifery.iocspublisher.org/index.php/midwifery/article/view/610