One of the only things that bothers me about e-cigarettes is that the fluid is quite toxic. I once spilled some in a grocery store and realized that an infant might, however unlikely it may be, get it on their hands/mouth and get sick or even die. I immediately cleaned it up with a napkin. Nicotine strength is also sometimes misestimated.
Be careful, y’all, especially if you mix your own, for your own sake and others’, and to keep it from being over-regulated.