Being freaked is good .... allowing your vent to clog is bad -- it can catch fire.
I would suggest looking at the length and turns in your vent pipe. Two recent clients had absurdly long and convoluted vent "pipes." Flex line is particularly bad because it slows the air flow. You want as much smooth conduit as you can manage and avoid turning them straight up or having too many turns.
If you cannot manage those problems, then make hubby clean the vent pipes every three months. Make him some cookies as incentives.