A growing number of Americans are reading e-books on tablets and smartphones rather than dedicated e-readers. That bring said, printed books still remain much more popular than books in digital formats – at least in the United States. With smartphones, tablets and e-readers reaching mass adoption over the past few years, many have predicted that printed books will soon become a thing of the past. And while it’s true that people use their electronic devices to read, they still rely heavily on ink and paper when it comes to reading books.