Don't try to scare the guy!
What you're experiencing, according to all that's written out there about stopping smoking and starting vaping, is fairly normal. One key item here, as it is in all of life, is that what you experience, how you experience it, when you experience it, and how long you experience it, will be largely based upon your own individual physiology.
Coughing, wheezing, sore throat, sinus troubles, and a few other fun things seem to come along in the early stages of vaping. Yes, your lungs do start to "clear" themselves of tar and other associated tobacco byproducts. Beyond some people having sensitivities to PG and/or VG, you are teaching your body new tricks. You are inhaling something new that you've never inhaled before and your body has to get used to it. Much as you had to get used to inhaling tobacco smoke. For those that do not have a natural sensitivity to the ingredients in eliquid, these symptoms seem to pass in fairly short order. And your lungs clearing and having a cough doesn't necessarily mean you're coughing up a bunch of stuff. I cough much less since quitting smoking and starting vaping about 2 1/2 months ago. I had the sore throat and coughing period a while back, but it didn't last long. And I did have some wheezing that came when my smoking wheezing had gone away. Seems to be associated a bit with whether I was vaping really heavy that day or not.
Congrats on making the change.
Steve