Smoking as A Risk Factor of Low Superoxide Dismutase (SOD) Levels and Early Aging in Women Aged 20 to 35 Years Made Hermina Laksmi, Ketut Kwartantaya Winaya*, I Gusti Nyoman Darmaputra, Luh Made Mas Rusyati, I Gusti Ayu Agung Elis Indira, and I Gusti Ayu Agung Dwi Karmila Abstract Background: