I am new to vaping. I bought the Joye EGO-C upgrade and 18mg juice (multiple flavors). I am curious how much nicotene a single tank holds. Does the 18mg meen for the whole bottle? I havn't yet gone through a full tank in a day however if I have, I would like to compare the amount of nicotene I am consuming. I am a half to full pack a day of Marlboro Menthols. I have been getting some headaces, not really feeling there (kinda in a daze) I haven't had a sore throat but a feeling of a knot similar to just before you cry. Any advice is much appreciated. Thank you in advance