“If doctors say smoking is detrimental to your health we cannot forbid smoking lehalacha because the proof of the danger of smoking cannot finally be decided….. I saw Tzadikim who were smoking and maybe this is an explanation for their doing so”””
Unless you are engaged in really bad trolling, your comments about the “dangers of smoking cannot be decided” are bizarre. Any surgeon who does lung surgery would be more than happy to show you the tissue of a niftar where the residue of years of cigarette smoking are not subject to question. While there are certain areas of mortality/morbidity where causality is arguably still an open issue, smoking is NOT one of them and there is absolute certainty about its dangers. I can only assume that the so-called “tzadikim you saw smoking were sadly addicted and unable to control themselves OR have not seen a doctor in several decades and don’t read any newspaper or expose themselves to any media and are oblivious to the fact they are slowly killing themselves (and potentially those around them if they smoke at home).