Islam does not allow considerable harm to self. Little harm like drinking tea with little more sugar, eating food with little more of salt or spices, drinking water or drinks which more cold than usual is not good but not Haraam. Haraam starts when the harm is considerable. Smoking was taken by many scholars in the past as not considerably harmful, but after recent medical findings, it has been considered by many of our scholars as considerably harmful, hence, it is not allowed because of the considerable harm which it causes.

You may seek the verdict of your Marje' of Taqleed on this matter.

Wassalam.