I didn’t know that. Chloroform always helped my girlfriends melt into my arms, but I never thought about its use on PLA. (Huge /s for people who think I was serious.)
While I was googling around about chloroform smoothing, I also stumbled upon ethyl acetate as a smoother for PLA. It’s probably better for your internet search history to go that route instead. I have a ton of weird shit for my engineering fascinations, but a bottle of chloroform would probably be at the top of that list.