When I started vaping a few years back, JC had a reputation for killing atty's. I never had the problem. Was I lucky, I'm not sure, but I don't think so. I went through quite a few bottles of JC Tenn cured and Original Tobacco.. I used 510 atty's as Carto's weren't around for the 510. I would always blow out the atty and every now and then clean it by soaking in alcohol. Your atty might have just grown old and gave up the ghost. Am I sure, no. I don't think that JC has had a bad batch in some time. I still have a few bottles of Tenn. Cured and JC original around that I vape from time to time. I prefer 36 mg juice so I haven't bought from JC as of late. That's a shame because I love the Tenn cured. When using any thick, sweet, vg type juice, make sure you keep your atty's clean and blow them out every night. As far as Carto's, make sure you keep them moist by topping them off, even though they might not need it. Try to stay away from extra thick, dark, sweet juices. Hope this helps. Works for me.
Dave