We all know what smoking means but in precise scientific terms, it refers to the inhalation of the smoke from burning tobacco encased in cigarettes, pipes, and cigars. So, you can say that you have a smoking habit if you suffer from a physical addiction to tobacco products.
While casual smoking is more an act of smoking occasionally, in a social setting or to relieve stress, habitual smoking is a psychological addiction, and one that comes with serious health consequences.
Keeping Away From Vices : Bad habits are impulses... so instead of controlling them, you often end up repeating them. Even though you recognize the stress they cause in your life... and you make promises to change your ways again and again, you repeat the same tired patterns! That's because habits like smoking, by definition, are acquired patterns of behavior that have become almost involuntary as a result of frequent repetition.