I was going to make a few of them http://unitednuclear.com/smoke.htm but then a few of my friends got quite paranoid about the legal side of things. Im sure if you do it on a bit of green by the river you should be fine...
they're legal as long as they don't cause a lot of noise/sight/smell pollution to others, this would be illegal in the UK: http://www.pirate-land.com/smoke1.htm lol
hey guys, i know a Very fast way to make a smoke bomb: take a ping pong ball, smash it into pieces and wrap it in aluminium foil. be sure to leave a place where u can grab it. now light it with a cigarette lighter. if u see flames just blow on it. u`ll have some consistent smoke ( depends how many ping pong balls u use) i only used 1 but it was enough to fill up my room with smoke...