Habitual activity is yet another item on the long list of constants among all people.Of course,Including good habits as well as bad habits - such as smoking,alcohol,overeating,nail biting. It's often difficult to understand why we create habits for activities that are bad for us either physically, emotionally, or socially, especially when we consider the consequences,however,we do.Luckily,many hours of research have been put into finding out the basic causes of bad habits.The bad habit like smoking can kill the person why you can't give up smoking.