Smoke-filled hallway - Question about hazard

[piratek098]

I understand that the player rolls the dice only if he has not declared before entering the room that he is blocking his mouth or should everyone test it at the beginning of the turn or at the very entrance?

[AceofMoxen]

It's been seven months, so this is a tiny necro, but that encounter seems very difficult. I would take any chance to make it easier, including I'm planning to add a scroll of gust of wind to the secret treasure behind Linzie's room.