Smygu sy'n cyfrannu fwyaf at y baich clefydau presennol yng Nghymru, gan achosi tua 5,450 o farwolaethau ac oddeutu £302m o wariant i'r GIG bob blwyddyn.
Smoking contributes most to the current burden of disease in Wales, causing approximately 5,450 deaths each year and costing the NHS an estimated £302m annually.