Reply To: Good Bachurim Can Smoke?! What’s the Purim Heter?

Bottom line, many decades ago, most Rabbonim did not yet fully know of the absolute sakana of smoking, both to the smoker and to those exposed to the secondhand smoke. Now they do, and a p’sak sometimes DOES get modified as new information is discovered, and rabbonim realize that the original heter was based on incomplete evidence.