I was getting random headaches, not from nic OD or dehydration. I did manage to not quite pinpoint but the general area of the "sour" that some commercial juices might have. It wasn't till I began DIY I did find that some flavorings gave me headaches. Lemon, lime and a flavor called champagne when I was first beginning to experiment with combos gave me between the eyes headaches, not a bad headache but a lingering all day aggravation. Some tobaccos that have that stale ashy smell and taste would give me headaches also so opening up a new bottle and a sniff right away said if I wasted my money or not.
With commercial juice you really have no idea whats going into them but as DIY I know to steer away from those kind of flavors and haven't had a headache since.
If your really unsure about a juice and since its only 6nic, put a few good drops on the back of the hand, taste and wait a bit to see if a headache is forming. I've been using the hand to taste juice for eons and lived to tell about it.
As a side note really sweet juices also dries out your mouth badly leading to that unquenchable thirst that could be a foundation to a headache building. I drink a fraction of the water with DIY juice than I did when I vaped commercial juices since my DIY juice isn't sweet and I add no sweeteners.
With commercial juice you really have no idea whats going into them but as DIY I know to steer away from those kind of flavors and haven't had a headache since.
If your really unsure about a juice and since its only 6nic, put a few good drops on the back of the hand, taste and wait a bit to see if a headache is forming. I've been using the hand to taste juice for eons and lived to tell about it.
As a side note really sweet juices also dries out your mouth badly leading to that unquenchable thirst that could be a foundation to a headache building. I drink a fraction of the water with DIY juice than I did when I vaped commercial juices since my DIY juice isn't sweet and I add no sweeteners.