Said Landeskog, "Maybe right now it's hard to put into perspective, but for him and for myself to be a part of that, for him to get that here on home ice is very special. I'm sure he's been waiting a long time to get that puck."
Smith, who is from Dearborn, Michigan, was the Nashville Predators' second-round pick (No. 54) at the 2007 NHL Draft. He signed with the Avalanche as a free agent July 1, 2016.
"I always wanted to make it to the NHL, not just make it but be successful," he said. "This is the first step in being successful, getting that first win."
Sam Reinhart, Marcus Foligno and Evan Rodrigues scored for Buffalo (26-25-10), which hadn't played since a 5-1 loss against the Chicago Blackhawks on Feb. 19. Robin Lehner made 25 saves.