Why does my house smell like weed?

I live in a townhouse, but the way it’s laid out we only share one interior wall on one side, and we all have separate air systems. I don’t smell the weed smell outside. Neither my husband nor I smoke. My house has been top to bottom deep cleaned SO many times trying to get rid of the smell but it is so strong. It’s most prevalent downstairs in the mudroom area but sometimes in the living room.

why is this happening? how do i get rid of it? our unit was freshly renovated right before we moved in and no one ever lived in it before us.