A vaporizer is a device that produces a jet of steam.
Well, simply put, steam with medicinal herbs or their essential oils is sent to your face. The autonomic nervous system relaxes. You feel it: the steam envelops you, and the smell of herbs soothes you. - You are pleased!
In addition, steam forms water condensate on the surface of the skin, which penetrates the hair funnels (pores) and creates a layer between comedones (blackheads) and the walls of the hair follicles (part of the hair inside the skin). Now the comedones are separated, do not stick, and are easily removed, which undoubtedly pleases us! More steam softens the skin, which makes it easy to clean it from keratinized scales (dead cells).
Well, I’ve also told you a bunch of terms (I’ll also talk about them later). But now you know how steam works.
And please don't listen to ignorant "open pores and close pores" horror stories. This does not exist in nature!