Just wrote Jack an e-mail concerning my last order. First of all, Jack is a fantastic guy (educated me via phone for a long time). Anyway, I ordered the SmokeTech 1.7 ohm SINGLE coul cartos in xxl. First order were 5, 2 DOA. However I thoight it was no big deal since the working ones were the best cartos I've EVER used (GG Stealth). I loved them so much that I ordered another 15 even though I'm based out of Canada (plus no US supplier has these). Got the new batch about 3 weeks ago. 11 out of 15 were unuseble. Most of them were straight DOA, the others had a terrible chemical tast/smell and would't vape either. I am wondering if I got a bad batch or if that's the norm. Anybody experienced the same problem. Again, there are not the dual but single coil 1.7 ohm xxl. I really hope this was just a case of bad luck. Got very frustrated when I dilled up the last one with the rest of my fave COV juice and again, wasted a lot of juice. Smoking an analog right now bc I'm so frustrated. I know it's not Happy Vapo's fault and hope that I just got 2 bad batches. When they work, there is nothing comparable. Hufe vapor, great taste and they last a very long time. I don't think Jack has a warranty on cartos, but hope we can make it somehow right. Anybody else having the same problem? Thanks a lot and I love Jack's dedication and HP 