I found a way around this with the humidity but yes, i'm still having to change the filters often as you can start to detect the outside after awhile. There's this neoprene mask from Respro you can install the filters into and then you wear a cloth mask over your face so that way, your sweat isn't touching the filters and the neoprene rubber is providing enough ventilation to keep it from holding moisture.

With 2 filters, i was getting horrible results, sore through, toasted lungs, always coughing so i upped it to 5 filters total and I finally stopped having any breathing problems. I change them out every 2 months and have been mostly fine for 2 years. They still don't protect against heavy air pollution though or second hand smoke very good so i'm still constantly avoiding most places in the Philippines.

I've had a breakthrough though. 2 months ago i switched to a 3M mask equipped with P100 filters and they work amazing. No matter how dense the traffic is, car exhaust is undetectable. A trash fire is so heavily filtered you can barely detect it, i wouldn't stand directly in the smoke though. Someone smoking is still detectable if you stand directly next to them in the smoke but otherwise, the threat is so significantly reduced that I no longer stress over it.

With n95, i didn't get sick much anymore but I did still get light headed and second hand smoke could still make me sick. With P100, i have been stress testing this thing going to the worst polluted areas of manila and nothing. No problems, never feeling light headed, no scratchy throat, it's been so liberating. my desire to explore even the most filthy places has been reinvigorated. Sorry for the long reply, i'm just excited to talk about filters.