I sometimes get headaches after using the ecig. Yesterday I noticed it after smoking and thought it was just a dull headache but today it did the same thing...right after I get done smoking my head hurts. Ihighly doubt this is caused by nicotine because I use snus also, and it has a lot more nic than the ecig. I'm thinking maybe it's something else (in the liquid) that's causing it. Possibly the Propylene Glycol? Anyone else here experience headaches after using the ecig? I've been using Janty RY4, not sure if that one contains PG or VG. THink it might be a good idea to try a VG based liquid and see if the headaches go away?