"Where there's smoke, there's fire"

For long it has been said that where there's smoke, there's fire. That all was before the age of chemistry. Now its not a hard job to produce some nice thick white smoke without any fire at all.

You only need concentrated ammonia and concentrated hydrochloric acid solution. Dilutes will also work. If you do not have access to a laboratory or chemicals, you can get the hydrochloric acid in the open market as muriatic acid(cleaning agent) and ammonia in blue print shops.

Soak two pieces of cotton wool in each solution and keep them beside each other and experience the holy smoke.

What actuallly happens is hydrogen chloride gas evolved from hydrochloric acid and ammonia evaporated from ammonia solution comes in contact each other in mid-air and forms fine particles of ammonium chloride, which constitutes the smoke.