My experience was hit and miss. After a week of
vaping, i developed a couch, not a bad cough and it was (productive) flem was being coughed up. I thought i was getting ill, but that wasn't the case, I started to cough up think blackish/gray crap and that was horrid in every aspects and it last almost week. after that week all symptoms went away and since i started
vaping a 1 1/2 years i haven't been sick (hope i didn't jinx it) since i started
vaping.
I have always had clear skin, since i started vaping i get occasional pimples, i don't know if its vaping or no analogs or just pure coincidence. The issue isn't serious enough for me to investigate it. I think the longer you smoked analogs will have to do with, how your body reacts without them.