THE 5-SECOND TRICK FOR SMOKE 

Ringelmann scale. A measure of smoke color. Invented by Professor Maximilian Ringelmann in Paris in 1888, it is actually a card with squares of black, white and shades of gray that's held up as well as comparative grayness of your smoke judged.The nicotine and additives in cigarettes share a backlink to cancer and An array of other negative health