It's a very poorly written article that was probably thrown together based on a very limited set of available numbers. You are correct, though, numbers don't make sense.
What I find more interesting (and even harder to believe) is the fact that the "big three" mentioned in the article have a combined 65% market share. The article says analysts predict sales of e-cigs AND vapor products to hit $4.1B in sales. So not only do the numbers not jive, but I find it difficult to believe the three brands mentioned have a combined 65% market share. I personally know dozens of folks who vape...not a single person I know who vapes uses Vuse, blu or Mark Ten e-cigs. They ALL use more advanced vaporizers that you order online or find in a B&M that specializes in vape equipment, not the "Big Tobacco" cigalikes that you get from Circle K, 7-11 or AM/PM (or whatever local gas station convenience store happens to be in your neck of the woods).