I chain Vape 6mg all day long. I go through anywhere from 10 to 12ml a day. No ill effects at all. My husband Vapes 18mg. He also goes through the juice. Neither of us have any symptoms. We love it.
You do realize caffeine will also give you most, if not all, of the same symptoms?
No offense but common sense told me when I began to lower my nic levels because of how much I Vaped.