About a week or so after putting down analogs, I went thru a few days wherein my sinuses drained like mad and I was coughing up great gobs of brown-flecked goo. Then, for the first time in decades, my sinuses were clear! It's been almost two months and I haven't coughed or had to blow my nose since then. Every time that I tried to quit cigs before I would promptly get a cold or bronchitis on top of—or because of—clearing out my system. I believe the PG in e-juice has kept me from getting sick! Well, that and not having my immune system stressed by nicotine withdrawal. Switching to vaping is the greatest thing ever!