SMOKE GRENADE
Cheapest easiest way to make a smoke grenade.
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MATERIALS
For this awesome trick all you need is some PING PONG BALLS and TINFOIL.
PREPARE PING PONG BALLS
For the most amount of smoke I suggest to cut ping pong balls into a little pieces. Not tiny tiny, but small. About a one square centimetre. Although I haven't tried to grind them into a powder. For this smoke grenade I used 4 ping pong balls.
WRAP IT IN TINFOIL
LIGHT IT UP, MAKE SOME SMOKE :)
Now go outdoors, light it up by heating one side of foil. You want to make sure that pieces of ping ping balls get hot and ignite without touching a naked flame. After less than a minute you should see some smoke, throw it away or place it on the ground and enjoy your smoke grenade.
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WARNING!
Do not try this indoors. Smoke is poisonous and can be dangerous.