I was once advised by a Hindu doctor to use Ayurvedic herbal cigarettes to combat the heaviness in the stomach after eating. the very process of smoking stimulates digestion. The cigarettes themselves did not evoke the aversion that non-smokers do from regular cigarettes. If not overused and used only to create an image, there won't be much harm.
Had experience of smoking herbal cigarettes. Should not be doing that. If you want to smoke them for the sake of the image, then this does not make sense, since you will smell of burning foliage at a distance of about five meters - not the best gimmick. Well, by themselves, they taste so disgusting that the gag reflex does not stop for half an hour after smoking. It is important to understand that herbal cigarettes are designed precisely to discourage a person from smoking regular cigarettes. And so they cause about the same amount of harm to the body as ordinary ones, since in this case you also fill your lungs with smoke, just in this case it is smoke from herbs - like breathing deeply in the middle of a forest fire.
Any burning fiber is carcinogens and solid microparticles of soot. So they can hardly be safe.