Smell with proper filtering

Alright.
We all know smelly people get used to the smell and can't notify it themselves.
What I hear of is that if/when a carbon filter loses its filtering ability, it slowly starts to let thru smell which then contaminates the clothes and people living in the apartment so that other people can smell it when the occupants are out of home.
Any truth in this? Starting to get worried here.

Yes there is, you can get desincitized to smells, but as long as you are not already acclimated you should be able to notice the smell if it's seeping through your filter. You can always invest in a second filter as back up in case you have a failure or pick up some ona gel and put that in your room as well.

Two papers published in the Dec. 8 issue of Science show that a protein called CNGA4 helps plug the "nose" of odor receptor cells -- neurons whose job is to detect smells and send that information to the brain as an electrical signal. The "nose" is really a channel in the neurons' membrane that opens when an odor is presented and closes as the neuron becomes desensitized to that smell.

Source: http://www.sciencedaily.com/releases/2002/02/020205080446.htm