“Tiny amounts, whether ingested or absorbed through the skin, can cause vomiting and seizures and even be lethal. A teaspoon of even highly diluted e-liquid can kill a small child.” That’s how the NYT’s Matt Richtel describes the flavorful and colorful chemical cocktails that are used to fill e-cigarettes. How dangerous are these liquid blends? We don’t really know. So far, e-cigarettes and e-liquids are excluded from federal regulation.