Not sure when this began since I reinstalled it after some time, but it's a really common issue. Smokes are now useless, or even deadly, in Hardcore Co-op. Here are a few examples from the dozens of times I've been killed by the ghost in the fog.
https://streamable.com/rgxetn
https://streamable.com/wqn9kc
https://streamable.com/54ujxi