I got away from using Stainless Steel coils before because they seemed to make me cough a lot. I really never figured out what the issue was but I could use the same setup and juice with Kanthal coils and I didn't have that issue. I gradually went back to using some Stainless coils and seemed to be doing okay when "Bam" it started happening again. I even started getting a heavy feeling in my chest. I rebuilt a couple of my tanks with Kanthal and I when I vaped them, I could tell an immediate difference in the feeling in my throat and absolutely no coughing. Does anyone else have a sensitivity to Stainless ? The heavy feeling in my chest is better but not completely gone but I think it will probably clear up after a few days if I stay with the Kanthal. I have eliminated by trial and error all the other variables that could be causing this issue and it is definitely the SS coils.