Smoking should be banned as it not only destroys the life of the person addicted to it but also affects the common people. Whenever a person smokes in public place, a common person who is just standing nearby gets affected more as compared to the smoker. Smoker destroys his/her life willingly but they don't have any right to destroy the life of any other person which they indirectly do.
People say that they started smoking just to overcome work pressure, tension, etc which all are bullshit. It totally depends on the individual mindset, how you react with the situation and how you deal with it. Everybody have tensions, etc in their life in one or the other way and if "smoking" really helps in overcoming tension then each and every person would have been smoking.
Smoking just acts as a poison in one's body and hence a individual should try not to get addicted to it and whoever already addicted to it should try to just quit smoking. Quitting smoking is not that easy for a addicted person but if one try he/she surely can do.
And at last concluding with my ideas, smoking should be banned completely for the welfare of each and every citizen of the country.