3 ms·Swamp and marsh fire smoke can be especially bad for breathing10 points by DoreenMichele 3y agohulitu 3y ago> Swamp and marsh fire smoke can be especially bad for breathing Any smoke (even holy smoke) is bad for breathing.gausswho 3y agoIt really does feel awful breathing this in in New Orleans today and noticeably affects my stamina. Moreso than the wildfires this summer in New England.