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http://www.china-page.com/company/xinli/welcome.html there says there exists colored flame candles. How about changing the color of the cigarette tip?
Flame and bead tests [.pdf]
Which colors go with which metals. Looks like I got copper right. [Uncle Nutsy, Feb 15 2001]
What's in cigarettes
Anti-smoking website that cites a U.S. Department of Health study finding 76 metals in tobacco, chiefly arsenic, cadmium and nickel. [Uncle Nutsy, Feb 15 2001]
||Changing the color of flames is easy- just add something to the fuel source. If I remember flame testing from my 11th grade Chemistry for Budding Pyromaniacs class correctly, copper burns blue or green depending upon what substance it's in, f'r'instance.
||The problem with doing this for a cigarette is that you'd have to breathe the metal in question. Now, to some degree cigarette smokers already do this- tobacco is relatively rich in metals. But whether they would want more metals- or whether adding copper or rubidium or whatever would interfere with the rich, smooth taste smokers crave- is a broader problem.