Talking of smoking...We had some hippyish friends who we renovating an old house in West Wales and living in a caravan onsite while doing it. Their cats used to doze on the top of the cupboards in the caravanWe went over to see them on a wet afternoon, and the atmosphere inside the van got quite...aromatic. As the smoke level rose the density a ceiling level got pretty high. Kerthump, kerthump as the cats fell to the floor bleary-eyed and staggered out of the cat flap in search of snacks