Hahaha I don't know about that homemade version. We don't need to fill a city block! Then the cooking part sounds a little scary, I can imagine if I messed it up how mad my wife would be lol. This smoke ignited then dissipates in about 30-45 seconds so you have to be quick with it.
It was a lot of fun for sure! Thanks for checking it out! We enjoyed doing it and are already looking for more things to put smoke bombs in and take pictures.
We when made them as kids we used a double boiler, on low heat there's no danger (it won't explode or anything like that). You're basically just melting the sugar. The first time we tried to make them my dad decided to speed up the process and use the microwave instead of a double boiler. I don't know about a city block but it damn sure filled the house full of smoke (and the microwave with purple flames).