Yup the cabin air filters are supposed to be changed every year or 15k miles, whichever comes first.
Something I've made a habit out of doing is running the fan only (engine off, no compressor) on a higher setting a couple times a month, usually right before washing the truck, and spray some lysol into the cowl. Only takes a few minutes to do and keeps everything clean. Just raise the hood to get to all the air intake holes. Oh and before you do that make sure there aren't any leaves or any other debris blocking them... as the stuff sits there it gets moldy and that will introduce even more stink into your vehicle.
Something I've made a habit out of doing is running the fan only (engine off, no compressor) on a higher setting a couple times a month, usually right before washing the truck, and spray some lysol into the cowl. Only takes a few minutes to do and keeps everything clean. Just raise the hood to get to all the air intake holes. Oh and before you do that make sure there aren't any leaves or any other debris blocking them... as the stuff sits there it gets moldy and that will introduce even more stink into your vehicle.