Was asked for more info . So here are a few photos . This mini humidifier uses water only to generate fake smoke no smelly baby oil & varsol odor 50%-50% mix for Graupner smokers .I get the power to run unit from the receiver battery port as the unit uses a USD port to make it work so I got a old servo & cut the wire off it removed the signal white wire & used the black & red wires to power up unit . I have to turn model on then power up the Humidifier to start fake smoke put the cabin on model & away we go. Make sure Positive & Negative are put in proper receiver slots Please don't damage receiver if it's plugged in wrong.

Using the e-cig element in the alloy box again but with the old smoker pump bored out and converted to a single outlet in line with the piston. Even makes a cool sound out the exhaust side!. Still waiting for my air pumps so just playing around in the mean time. Also trying glycerin and water 50/50 instead of baby oil. The pump doesn't shift much air ( slightly more blowing than sucking, - sort of pulsing back and forward) but if I blow down a tube I get clouds of smoke, I'll see what the air pumps do. Still only running on 2v.
JB

This version of a smoker box uses an E-Cig element in an alloy electronics enclosure.I gave the lid and box a 7mm haircut on the mill to reduce the size, (now 50x50x26, - was 50x50x33) but it could still be 1/2 the width. haven't found a smaller alloy box yet but might come across one, (only really needs to be 35mmx35mmx25mm The element is mounted on a bracket screwed to the bottom of the box (the box being the resevoir and neg) and against the outlet tube, and the pos wire runs through the side (in silicone tube) to the element.

The box is packed with cotton wool which is surrounding the element and soaked in smoke fluid (in this case baby oil) but leaving a passage through the center for air flow. I'm waiting for a couple of air pumps to arrive but I've used the old smoker unit pump again to demo the smoke and pulsing, (makes good smoke rings too)😊

The element is capable of taking 4.5v, but I'm only using 2v for the test and it smokes quite well. The pump is running on 7v but can be varied from around 3v - 8v. The large tubes are to allow for later exhaust fitting (water or dry stack). Once I get the air pumps I'll be running this one with the water again. I've done this (like Grahams version to be able to easily replace the element as the Heng Long smokers, while working ok (but noisy) have non replaceable elements, so if you kill one, it's off to file 13 at the end of the bench😉😁

The pump actually works quite well and if you mount it on sponge rubber it is reasonably quiet and could still be useful in a boat with a bit of interior room.