when it is harmful to smoke ,then why still doctors are smoking?

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Everyday, we can see hoardings and pamphlets about the ill use of smoking and its causes.It is estimated that almost 60% of the total budget on healthcare is spend alone to curb these nemesis. Inspite of these, we still see doctors and medical practitioners still smoking in public. what type of image are they trying to create?Why is this so?how can we solve?