Health:
Reb Moshe ZT”L NEVER said muttar. I have heard that stated many times, yet no one has ever succeeded in finding where he saud muttar. The tshuvah that this “heter” is attributed was a question of whether one can supply a match (or lighter) to a smoker, considering this being a possible aveiro of ???? ??? ?? ??? ?????. Reb Moshe clearly states that smoking should NOT be done, but that there is inadequate information to make this ???? ???.
I suggest that the tshuvah published by the RCA be reviewed. It addresses the subject in great detail, and explains the parameters of each and every concept involved ???? ???, ???? ????? ?’, etc. I classify myself as more right wing than RCA, but that tshuvah is incredibly accurate and responsible. Google it. It is available as a pdf file for download.