Blowing Smoke For fun or science. And it's not actually smoke, but a fog created the same way they do for movies and heavy metal concerts, only this time with Zero Toys like the smoke-ring-blowing Zero Blaster or the fog-producing wand, the Wizard. The 3-ounce replacement bottle of non-toxic fog juice is good for 25,000 smoke rings or a whole lot of fog (with Zero Toys only). Better buy two, just in case.