When I transitioned from smoking to vaping, I hacked up oysters for a month I thought my lungs were coming out of my body. Doctor told me it was good that I was coughing the crap up after that never chucked any lung butter up again. Now I rarely get sick but when it does happen vaping doesn't make it feel better and have to take it down a notch until well again, large plumes of anything while sick will be irritating. Smoking also didn't make me feel good when ill and I would get pneumonia, sinus and lung infections all the time and had to do the teeth grinding for days to allow a window to wellness.