simple home made:
small metal box, maplins used to sell these, you can pick the size and shape to suit your model, ebay is full of them.
get a small fan, the sort from a pc etc, again, size to suit, and it will run on your drive battery, so when buying, check the operating voltage. Cut a hole a bit smaller than the fan in one side of the box, the fan will drive the smoke out. Between the fan, and the box, have a piece of thin plastic, it will need to move to make the hole bigger or smaller, to be adjusted when testing so you can limit the amount of air entering the box via the fan, as the fan speed will be constant.
Drill small hole either end, make up two rubber grommets for these holes. Next, pinch the heating element wire from the missus hairdryer, or something else!. make a wick from a wooden dowel, wrap (coil) teh wire around this, and have it enter and exit the box, the grommets are so the wire does not touch the metal box, as it will short out. using ole fashiooned loft insulation, fill the bottom half of teh box, and rest the dowel on this inside the box.
soak the insulation, and the dowel with baby oil (I moix baby oil with disco smoke fluid, but you wont be able to get this, baby oil works fine)
Using a spare channel on your transmitter, a switch on/off, make up a microswitch of some sort so when you flick the switch, the microswitch makes the circuit. The feed will be either end of the heating element wire. Now, the supply voltage, and length of wire, will determin how hot it gets, this will need experimentation on your behalf, too hot, it will just burn out, too cold, it wont heat up.
Wire the fan into the circuit, so it comes on, the fan will blow the smoke up the exhaust etc, or whatever you use.
Thsi is the basic principle of the rc tank smokers, its just hot oil smoking. Every 15 mins or so, you will need to wet the wick again, I use a syringe and just pour down the funnel on my boat.
There it is, a bespoke smoke machine, using probably thingsd found around the house, or bought very cheaply
My box is directly under the exhaust stack, you could use tubing to direct the smoke