i orderd from dfw vapor & like theirs a lot. i havent tried a lot of flavors but those taste very good.i orderd from the flavor shack & still havent got it yet, but they have nic in 48 mg [they said it was to mix -w- other juice because its too strong without doing so] & i got that & liq flavor to put together .i wanted to get some 100 percent nicotine to add into the plain 0 nic liq but im not sure how much add or if is worth it [since i found 48 mg strong anyway] ,so im gonna be safe & get the pre measured kind & buy flavor to add.i dont know if you can overdo it on the nicotine & get sick, so im gonna be safe & get the pre measured .i smoked over 30 years & went for 3 months w-out having even one,then i lost both batteries now i have all new bats & a usb,& just am trying new liq .when i first started all i could find in juices was american made liq 18 mg & didnt need even 1 smoke, so i guess if you vape a lot you shouldnt get a high dose of nic its maby like having 3 or 4 real cigarettes at once, so im going to be aware of that & make reg. & weak juice because i bet you could get sick on too much added nic if you dont pay attention to how much you vape. i love the flavors & like vaping for the the taste too.