Smoking is different from drinking (alcohol) and eating fatty foods in that the latter 2 can be consumed in moderation with no ill effect. But with smoking there is no “golden mean” for two reasons- it is not a controllable habit (i.e. no one is able to smoke only 1 or 2 cigarette a day after a while) and also because even moderate smoking poses severe health risks.
If someone needs to smoke, at least switch to a pipe or cigar. No tar and no deep inhaling, it’s not good but it’s better.