Lately I've been coughing my ass off even just vaping the volcano. I had a friend suggest that my screen was possibly clogged up with old stuff causing extra irritation. I also think it could be because my scale broke and I may have been over filling the chamber for my lungs ability to handle with such chronic bud.
The screen I was using was a screen that is made for concentrates, so it's really thick, mesh like screen. I could see how particles could get caught up in it. I switched back to the original style screen, which is quite thin. I'm also putting in less bud, and it's much easier on my lungs. I'm surprised what a big difference it's made. I'll have to try filling the chamber with too much again to see how it effects me. I think the volume had a lot to do with how bad it was making me cough. If you think about it, more bud means a higher particle density in the vapor.