There was a
thread on here about the Vapor King type
devices burning the poly fill material in the cart. There was even pictures. I have no personal experience with them but I would check that out first. Plus they are not made to be refilled although some people do refill them.
Most of us would advize that you get a manual switch
device as well as remember:
Rule of Thumb: the more it looks like the real thing, the worse the performance and reliabilty.
I would suggest you look at the Joye 510, the DSE901 - manual battery option only or one of the 7 premiere devices such as the Screwdriver, Prodigy, Janty Stick, etc.
And BTW, the Blu along with the Njoy and SmokeEverywhere are the worst reviewed devices made.