Smoking and Halacha

 https://ohr.edu/this_week/insights_into_halacha/5717

Several years ago, his son, Rav Dovid Feinstein shlit”a, was quoted as saying that with the current knowledge of the harm smoking causes, it is pashut that had his father, Rav Moshe, still been alive today, he would have prohibited smoking outright, as his dispensation was only based on the ‘fact’ that smoking endangered only a small percentage of smokers.[26] Indeed, in a newly discovered and recently published teshuva of Rav Moshe’s, dated Elul 5732, he himself wrote that his famous lenient psak was based on the facts as they were known at the time.[27] He added that if the metzius would change and the percentages of those proven harmed by smoking would increase, then certainly it would be prohibited to smoke, at least the amount the doctors considered harmful to one’s health.