Optimo I have had some 306's last for a year. I do the method I posted above and believe me when I say I try to kill them and most of the time I dont succeed. I will admit there are a few different ones out there that are garbage but I believe it is more a quality control issue where they come from (China). They dont care what they send to us and Lead in toys is one point but there are many. I think alot of the issues with them is more human error than actually defective devices. I have been dripping only for about 2 years now and never like any cartomizer, or anything that had some sort of batting material in it. The less things we us and add to the overall equasion I feel the less chance of inhaling more harmful things. Especially the nasty primer in atties..... This is only my opinions and everyone is entitled to theirs.