Smoking to calm nerves while saving lives on Shabbat

Hi,

One who is engaged in saving lives on Shabbat, and who wants to smoke to calm his nerves, should find another means of calming his nerves, among the many means available. This is not a fundamental part of saving lives, such that it would justify violating Shabbat.

(Rivivot Ephraim 1:249:1)

Have a great day,
Mordechai