So when i got my first e-cig it was a 21st century brand and one the cartomizer it said 1.6% nicotine which i assume is 16 mg, aka a regular cig from what i heard. I ordered some menthol from myfreedom smokes and got the 18mg content pg/vg mix, great taste and decent vapor but it seems to make my had feel light headed. Now that could be because i'm vaping too much or too often, i guess my question would be, What is a good nic level to erder if i used to smoke about half a pack a day before this e-cig? also i definitely enjoy puffing on my e-cig probably too often because it is fun and enjoyable, should i just down the level or is that the feeling i get from maybe the pg or vg?