Smith missed two practices this week with a sore right ankle. He says he was only retaliating when Incognito tried to twist his ankle after the whistle.
The Texans (1-0) play at Jacksonville (0-1) on Sunday. Smith practiced on Friday and coach Gary Kubiak expects him to play against the Jaguars.
Smith says he's "disappointed" in the fine and plans to appeal. Smith was fined $7,500 last season for pulling off Baltimore guard Andre Gurode's helmet in a game against the Ravens.