Please can someone help me as vaping is no longer the pleasure it was as it keeps making me lightheaded. I reduced the nicotine strength from 18mg to 12 and when that didn't help I went down to 6mg. Yesterday I was fine on 6mg but today the lightheadedness is back! I've just added some 0mg juice to see if that helps. Is it normal to need to reduce from 18mg so quickly (about a week ago I was fine on 18mg)?