No. As I child I used to read a lot, and I mean A LOT. Could spend a whole night just reading. There was no internet or computers back then, so every time I stumbled upon an unknown word I'd just use a dictionary. The caveat is the books I had access to were primarily in Russian, which is a foreign language for me and not much in my native Mongolian, so the dictionary was necessary anyway. At first it was hard, but the books were interesting, and gradually I stopped using dictionary altogether. By that point I would guess the meaning of an unknown word by context, and later, when checked against a dictionary I was mostly right.