NOT KNOWN FACTUAL STATEMENTS ABOUT SMOKE 

Ringelmann scale. A measure of smoke coloration. Invented by Professor Maximilian Ringelmann in Paris in 1888, it is essentially a card with squares of black, white and shades of gray that is held up as well as comparative grayness from the smoke judged.The nicotine and additives in cigarettes share a url to most cancers and a range of other negati