When Fog Machines Attack: A Miniature Disaster

I recently tried to create a dense, low-lying fog effect for a miniature set (a tiny, haunted lighthouse) using a standard theatrical fog machine and a length of PVC pipe. The idea was to channel the fog directly into the miniature world, creating a creeping, ominous atmosphere around the lighthouse base.

The channeling sort of worked, but the sheer volume and velocity of the fog machine overwhelmed the delicate rigging of the miniature set. Instead of a gentle creep, I got a gale-force blast that knocked over tiny trees, dislodged miniature rocks, and even blew the top off the lighthouse. The fog itself, once it settled, was far too thick for the scale, obscuring details rather than enhancing them. It looked less like an eerie mist and more like the lighthouse was engulfed in a cloud of cotton wool.

What worked was the intention, the low angle was right. What didn't work was the tool. In hindsight, a small, purpose-built miniature smoke generator or even carefully placed dry ice would have been more appropriate. I ended up having to rebuild half the set and simulate the fog digitally, which defeated the purpose of the practical attempt. Anyone have success using household diffusers or small vaporizers for miniature fog, and if so, how do you control the density?