Please don't do that. A more appropriate nic strength for that device would be 3--6 mg/ml not FIFTY. Oh my, I got nic sick sub0hming 12 mg (freebase) nic when I showed up here and I was a 3 ppd smoker.
DO not use that strength and type of nic (well, type would probably be fine, if you kept it to 3 mg/ml). It's slightly more bioavailable than freebase nic, but you can still USE nic salts in sub0hm devices, but the dose has to be reasonable. I mean, though, most sub0hm folks can tolerate regular nic at that strength, because it only gets harsh enough to "need" nicsalts at higher percentages, like the one you have. Nic salts can be used at that strength, in the right device.
Yours is not the right device, and not even remotely CLOSE to it. I use 18 mg/ml in NON sub0hm tanks and I've gotten nic sick before. PLEASE use extreme caution. Change your device OR your liquid, but it's definitely one or the other.
Anna