People start smoking with different reasons. Some try it just to experience it, some try it to feel good but at last it becomes habit for most of the people. Very few people can quit smoking if they want but most of the smokers can't quit smoking till the end of their life. We all know that smoking is injurious to health, then also people can't quit smoking.I think for those who can't quit smoking they can smoke in a limit especially for those who become a chain smoker it is important for them to limit their smoking, for example, if a person smokes 10 cigarettes a day, he can limit it to 2 or 3 cigarettes a day, this may even help him to quit smoking one day.