Sorry if this has been covered. My googlefu isnt very good. So today im doing my first DIY juice. I bought a pre mixed nicotine unflavored juice. It is 50/50 PC/VG at 14mg of nicotine. Bought it from Azure vaping. I added the flavor ( grape ) to the mixing proportions they recommended. 7.5 ml of flavor to 25.5 ml of unflavored pre mix ( its a 33ml bottle ). The flavor of the juice is decent ( i would prefer stronger flavor but afraid it will get perfumey ). I vaped about 1 ml of it and noticed and headache starting. I switched over to my normal juice and the headache went away. Any thoughts? Is it me or does anyone have any experience with this happening with DIY juice?