I have used an electric cigarette as a small smoke machine. My first version was bit and pieces glued together but that wasn’t very robust and broke. No that I have a 3D printer I wanted to revisit this project and make it properly.
Smokers can suck smoke to their lungs and blow big clouds of smoke. I’m not a smoker myself so that will only end up in coughing. So I wanted to reverse the operation and directly blow air into the cigarette and get smoke out directly. This way I also get great precision where the smoke goes, much more than with traditional smoke machines.