I even gave instructions where down the tool isle they are. Well, they even sell refills of some sort for it. I never bought one, -haven't had a reason to yet.
I use a cheap little Mighty Vac, - no smoke, just watch the gauge for leak down. Never had a leak I couldn't find.
I noticed Harbor Freight has an all brass vac tester cheaper than what I paid for a plastic Mighty Vac. I paid between 20 and 30 bucks for mine.