I'm 16 and my friends and I are into airsoft and I really want to impress my friends by making smoke grenades and using them while in battle and I have been watching videos and reading stuff and the best way to make one is using KNO3 or potassium nitrate. But i am pretty sure this stuff is illegal and it is illegal to make a smoke grenade. If someone can verify this and if illegal tell me maybe other ways of making a legal smoke grenade that is pretty good. Thanks!
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Call the police station and explain your idea to them. Tell them you don't want to violate any laws, but you just want to have fun with it.