The amount of magicians that give other magicians bad advice about using fire in their shows. The big thing is about getting permission or correct permitting to use fire. Many magicians repeat the old saying: “it’s easier to ask for forgiveness than permission”.
That is totally wrong!
There are many gigs where you absolutely cannot use fire. I worked a gig at a museum where an act got fired (no pun intended) for using a flaming wallet. The gig I was at last week had this sign in all the dressing rooms:

If you showed up to this gig and fire was a part of your show, like burning a dollar bill, you wouldn’t be able to do that routine. If you did fire at this gig, which is two weeks, you wouldn’t last long!
This is why doing fire correctly by asking for permission is KEY! You’d come into this gig knowing you couldn’t use it OR getting the correct permits, etc to be able to do it.
-Louie