Bought smoke tester to locate vacuum leaks, where do I plug it in?

[IS300E30]

I bought a smoke tester to hopefully solve a rough idle (RPM does not fluctuate) by possibly locating a vacuum leak. Where should I plug the smoke tester in to test for any vacuum leaks?

I know I should disconnect the intake boot from the AFM, and smoke the end that usually connects to the AFM. Is there anywhere else I should connect this to, to try to locate vacuum leaks?

FYI, this is what I bought:
https://www.ebay.com/itm/Automotive-...W/282339070632

[McGyver]

You've got it figured out. Remove the AFM, seal the smoke machine in the open end of the intake boot, search your engine bay for smoke coming out.

Fancier machines will have a float ball to show flow, which helps you to know when you've found all the leaks/if your leaks are acceptably low. Also, more smoke flow isn't always better. Sometimes excess smoke makes it hard to find the source. It doesn't look like your machine has a flow control valve, but adding one may be a nice upgrade.