 The number of people using high-strength vapes has soared almost tenfold in as little as three years. So these teenagers are going, look, I've already tried that vape. I want more. I want a higher hit. I want more of a hit to the nicotine. I want to really light it up. That's what the researchers are finding, and it's outrageous. A third of vapers or e-cigarette users used high-strength nicotine.