It's true that in some ceremony the pre action is to cover the person with smoke, to diminish for a short time the bio-feedback energy field and by this process the person easily filled with the ceremony intentions, shamans used to do it very often with great success.

Doing it too often may weaken the immune system because the bio-feedback energy field is also its protector...

I use smoke to cleartheenergy in my clinic but even there I do it once amonth to protect my bio-feedback energy field from beng too influenced with the smoke and in school Shoshana and other partcipators does it from time to time, in a protected way and some intention that will make it more on its holly action stage.