In relation to the "tightness in the chest", I am an asthmatic. In the 2+ weeks since quitting analogs and full-time vaping I can say, so far, I'm using my inhaler somewhat less. On high nics (24-25) I'll sometimes need to "puff the med", because it's irritated something. Vaping seems to aggrivate my asthma.
BUT, lets put this into perspective! During my smoking years, I would need to med after the majority of single analogs. Pretty often it would have been optimal to med mid-analog, just to FINISH that analog. While smoking, my nights almost always consisted of frequent awakenings to med, just to sleep some more. Essentially, while on analogs, my life was a dancing balance between the cig and the inhaler. And, since a pack of cigs was cheaper than a single inhaler, there were too many occasions where I've been hospitalized by the addict's choice.
I've yet to mistreat a carto as badly as any of the negatives related in this thread. Of course, through MY MONTH OF RESEARCH, I fairly came to the conclusion that MF cartos go to MF batts. I don't own any other products, so I don't face the temptations, that in retrospect, would seem silly. I'm also not in the position that ANY of my cartos are so expendable that I would go to any length to try and disassemble even a single one of them.
Perhaps it's the depth of research I did before I was satisfied with ordering, but in my mind, new ground-up tech shouldn't be expected to mingle with older improvement-lacking tech. It SEEMS like a recipe for disaster. To me.
And while you may argue that the THREAD FITS... there are countless things in this modern world that fit into other things. This does not mean they belong in those other things.