Get a millennial with a grape flavored vape pen.
Or
Make your own smoke machine...

 

I got the autoline pro off of amazon but all the inexpensive ones are probably pretty similar. It’s Fairly cheap and easier than making my own. I’ve used it on my intake, exhaust and evap and found the leaks right away. It makes good smoke and seems fairly well built, what more can you ask for. It would be nice to adjust the flow but maybe I can rig something up.

 

I meant to add... as I’m a DJ, look at fog machines also.
They are cheap and you can make your own fog juice with water, glycerin (Glycerol, or Glycerine... all the same), a couple of drops of bleach for sanitization and a dash of lavender fragrant oil.
Just sayin...

 

I just use my vape.