Originally Posted by Rugger_can
Most smoke is created using Sugar, Salt Peter and Baking Soda. And are not toxic at all.
Although I cannot with any certainty say that making and using a Smoke pot would be legal, although they are not explosives they could be controlled or otherwise prohibited. You'd have to ask someone with greater legal knowledge.
As a footnote to that, while KNSU (Potassium Nitrare/Sucrose) smokes aren't severely toxic (combustion produces Potassium Carbonate, an irritant), the mixture can/does burn upwards of 1000 degrees C (depending on the O/F ratio) and will easily ignite most things which aren't fire retardants, not to mention cause nearly instantaneous severe burns.
Generally speaking they aren't safe for game use.