I heard this firsthand from a materials science professor focusing on concrete mineralogy.
FYI, Sugar cubes can be fired via slingshot.

The last time this was posted, someone with more complex knowledge on the subject showed up with backing science that not only is this not true, but it until the mixture is around 10 percent sugar by weight, it has no noticable effect. So unless you’re carrying 400 lbs of sugar with you, the only thing you’d do is risk arrest.