I used to live in a pre Civil War home back in 2010. i was sitting in the (would you call it a "Den" I called it a Sitting Room) knitting and all of a sudden, the smell of pipe smoke fills the room. I am the only one home, my ex-husband and daughter were both gone for the afternoon, and I don't smoke. I looked around and could not find the source.
Many times when I was home alone (this happened a lot actually) where I would hear heavy footsteps in the attic area. Terrified, i would call my husband who would only tell me it was my imagination.
Finally, I'd had enough. After I had heard the footsteps for what seemed the umphteenth time, i called out in the sternest voice I could muster; "CUT IT OUT!"
The footsteps stopped, but every now and again, I could smell pipe smoke wafting through the sitting room.