Hey, i can share few thoughts ,hopefully you can relate and it would be helpful.
Are you are recent convert to vaping ?
Have you been a long time smoker ?
You might have noticed that there are some smokers that cannot handle vapor at all,they fell into a coughlock and look like they are suffocating,ugly picture. The reason behind this is that vapor is expectorant and your lung fill with liquids and it is trying to purge the bad stuff.
It wasnt until my 3rd year into vaping i felt i finally cleared up . So consider the shit that got in before you got into vaping and now wants to get out.
Also i dont dry vape often and if i do there is always a fine filter. Particles are the worst . ABV crumbs into your throat and lung causes irritation and mucus build up.
After over a decade into vaping ,i know what to avoid in order to reduce irritation . If you need to push your herb over the temps that forms benzene in order to get good clouds,then you need a better vape. If you are doing it because you like the toasty taste. Avoiding overheating your herb is like quitting combustion all over again .
Also no matter how clean are the materials used in vapes, dust,hairs ,herb ,oils often end up at the heater and even it if it all glass you are vaping shit,so be careful with that scenario.An easy maintenance vaporizer that is capable of delivering dense low temp hits is essential for me.I never use Dynavap with a torch. The outside of the tip and the cap walls get black residue with usage. I am guessing that is combusted herb matter and environmental dust. Most people dont even care to make their tip shiny and spotless in order to consider them clean enough.
IF you wanna avoid mucus levels you probably should avoid diary products for some time and see if it gets better. There was a thread onboard on topic somewhere.
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P.S Since there is a little language barrier on my side ,first thing i imagined as i read the thread title was that someone is dabbing phlegm or filling it in carts. I know it sounds ridiculous but since there are people that like drinking bong water ,you never know