>Try mixing up a 50/50 mixture of glycerine and
>water, then heating it with some nichrome wire
>in a short length of capped copper pipe.

Essentially how the smoke units available for model trains work, except I
believe that it is actually an oil that they use which when heated goes into
smoke mode, like overheating oil in a frypan. I believe valve oil for brass
musical instruments also works well.

Most of the smoke units available are from a European company called Seuthe.
The same units are marketed by almost every model railroad company that has
the facility in their locos to fit them.

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