No, adding 2 nics to 50ml is the same as adding 4 nics to 100ml, unfortunately. If it's 18mg/ml nicotine, you need to add 25ml of it to each 50ml. That's a ratio of 1:2, so you are diluting your 18mg/ml into 3 parts, turning it into 6mg/ml.
Shortfills as they are sold as standard only really work properly for 3mg/ml, unfortunately.
So basically 5 bottles of nic for 6mg to 100ml juice
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