I cannot figure this out for the life of me. Here lately I've been bouncing back and forth between 6 and 3mg ejuice. The 6mg kicks my nic cravings but always gives me a headache. 3mg on the other hand won't give me a headache but doesn't satisfy my nic cravings? Is it my set up that's giving me issues or what or should I try 4-5 mg nic? The current set up I have is an eleaf ipower and a nautalius mini tank. My ejuice is 70vg and 30pg and not sure if that has anything to do with it either?