1.in the short-term you will be less fitness and easily become breathlessness when you run.
2.in the long-term your heart will damaged and your lungs will become useless.
3.less serious,but still important is the cost of smoking.
4.cigarette prices are expensive ,and you will waster of your money
5.smoking is selfish as it pollute the air and the smoke makes many people felling uncomfortable.
6.it is also not good for your appearance outlook.