Like everyone else said, its mostly for the medical support Drs can give.
But there are situations where a doctor might tell you not too. As just one example, if the person has severe heart problems the doctor might tell them to wait because the stress of the withdrawal could exacerbate those issues. Ie: Try to stop smoking and die from heart failure.
So, yeah. Depending on the situation, they might say not to or to simply cut back on their smoking.
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