Why smokers have short breath?

因為焦油會痴住肺泡, 令身體覺得吸既氧氣唔夠, 所以會吸及快d.
而短就係因為肺容量細左(都係因為焦油), 所以任佢點吸, 都係得果少少位, 所需時間有限啦.
所以長期吸煙者既呼吸係快而短既~!

Some chemical materials, such like tar, will trap on air sac and destroy the function on gaseous exchange. When our body do not have enough oxygen, it will breath frequently to gain more oxygen.
And also, chemical materials will decrease volume of lung. The decreasing of lung volume also decrease the time on breath.
That's why smokers have short breath.