Ravenously chewing on everything

Ever since I can remember my LO has chewed on everything. I just thought it was normal baby behavior. He is 9.5 mos now and he ravenously chews on everything. Shoes on people's feet, tables, blankets, toys... he has 8 teeth already so maybe he's so chewy because of all the teeth coming in so fast? It's like he doesn't even "play"because he's too busy chewing on everything he can find.