I have asthma myself, so I know how careful one must be -- and I also have a major requirement for TH, but if it's too much, or too hot, that can give me a lot of problems. So I walk a tightrope between satisfaction and an asthma attack. As bad as cigarettes are, with all the crap they leave behind, they also somewhat anesthetize the bronchi, so my asthma, the general "tetchiness" of my lungs, has actually gotten somewhat worse, though I have very little coughing up anymore -- and I do have a lot more stamina; I can keep up with my husband, walking thru parking lots, and that takes some doing, when the mate in question is a former Marine! He's a very small person, but he's got that 36" stride right down pat.
If the cigarettes you've been smoking taste awful, but give you something you're missing in vaping, then you might benefit a great deal from WTA; it's worth a shot. It killed my cravings dead. Mind you, it won't do anything at all for purely psychological cravings, only the physical kind.
Andria