Haneen Hamed Alsulami, Zeina W. Sharawi and Fawaz Edris 2024. INVESTIGATING THE EFFECT OF CIGARETTE SMOKING ON THE NKX3.1 AND TMPRSS2 GENES ASSOCIATED WITH MALE FERTILITY: Received: 15th January 2024, Revised: 19th January 2024, 26th February 2024, Accepted: 29th February 2024, Date of Publication: 16th October 2024. LIFE: International Journal of Health and Life-Sciences. 10, (Oct. 2024), 37–49. DOI:https://doi.org/10.20319/lijhls.2024.10.3749.