Hello all! From time to time I purchase an eliquid that is weak in the flavor area so I buy pure flavor to boost it up a bit. Is there a rule of thumb that can be used when doing this or is it more of just a "to taste" thing? For example for a five ml bottle of a flavor say like peach how many drops of pure flavor or sweetener can be added before it's considered 'too much"? 
-Don
-Don
