These are bad, do NOT use them. I do not smoke anyways, and figured I would try them just cause I saw someone I know use them and it looked "cool".
I had the popular 'blu cig' for a month, returned them, but ended up with a staph infection (first ever). I truly believe it was related to it because I had a lowered immunity which I have never had before and started nearly exactly within a 1-2 week incubation/growth period from the start of my e-cig use.
Blu cig is company based in the southern US owned by another company that profits by selling pornography, just so you know... so there is a MORAL reason not to oblige a company like that... plus goes to show that satan is behind it all.
If you do not already know, the vapor is flavored by use of some sort of product that is supposedly PG-free (propylene glycol). This is the same ingredient in antibacterial products, cake filling, and food coloring. Ingesting orally has been shown to minimally affect humans, yet ingesting via the air passageways of the lungs has not been proven to be safe, and even preliminarily shown to be highly dangerous. Propylene glycol and other previous ingredients used in the flavoring/vapor of these e-cigs has been a big debate in the whole e-cig land (go check out some of their forums and occasionally you will see a member speak out about it, that is if he isn't banned instantaneously).
I highly recommend from personal experience not to use them and if you MUST smoke, to get a quality tobacco product made for pipes or personal rolled cigarettes and keep it to a minimum. I cant believe I even got them, they just seemed too "COOL" and a temptation. Sure its cool to look like you're smoking in public and just be able to say "don't worry, its not a real cigarette"... but your health is not worth the temporary cool-factor. The nicotine rush is there, but its too much/easy to overdose and hard to gauge because the smoke goes down way too smooth unlike a real tobacco smoke.