Looked at the smoke thing, it looks like what’s happening is that now light smoke is also adding to the duration of the smoke inhalation disease. Previously only standing in heavy smoke and fire would cause smoke inhalation disease, now all kinds of smoke cause it, and the duration of the disease just keeps increasing, which means you’re taking damage for coughing for longer.
So previously you might spend 3-4 turns in heavy smoke and accumulate something like 45-60 turns worth of smoke inhalation disease, now you might spend that long in heavy smoke, and also 3-4 turns in medium, and another 3-4 in light, which adds up to another 30-40 turns of inhalation.
The good news is that if you just wear a bandanna it gives you like 50% resistance to light smoke etc, and it looks like a filter mask will make you nearly immune to all smoke. Look for items that cover your mouth an have environmental protection.
Will probably look at capping smoke inhalation a bit too.