Because smoking gives you bad breath, yellow teeth and affects the health of hair.
2
你讨厌他的黄手指和黄牙齿；更严重的是，你知道在四十岁以后吸烟的他或她的寿命每年可能会缩短三个月。
You hate his yellowed fingers and teeth; even worse, you know that for every year someone smokes after age 40, his or her life will be shortened by three months.
3
吸烟不仅能熏黄牙齿，还会影响免疫系统，引起牙齿、骨质疏松的牙龈疾病。
Smoking not only stains the teeth, it affects the immune system and causes gum disease which can lead to bone and tooth loss.
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