Now that I been sucking on these ecigs for a few weeks, I have heard that 1 refill is equal to 1 pack,not 2 like I thought. Do other brands of electric cigarettes refills screw into the ecigs brand white part? Are they interchangable between different companies.Iam asking because I dont wana cheat and buy a pack of cowboy killers if I can just go to a tabacco shop and buy them there? because at 1 refill a day their costing me more then regular cigarettes. 10 refills cost 78 dollars shipped to my house. but I heard I can buy them cheaper. wow,this is making me sound like a real cheap skate isn't it? Well I am,lol... pete