[9] Public health researchers have suggested that this was in order to engage in trademark diversification (also known as "brand stretching") to promote the tobacco products, because it allows for advertising the brand in the face of restrictions on the direct promotion of tobacco products
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When More Doctors Smoked Camels Medical Claims in Cigarette Advertisements, 1888-1988 When More Doctors Smoked CamelsAn Exhibit on Cigarette Advertising, 1888-1988 Article by Margaret Irwin in the newsletter of the Houston Academy of Medicine/ Texas Medical Center Library January 1989 Exhibition Key for When More Doctors Smoked Camels: Medical Claims in Cigarette Advertisements, 1888-1988 (6 pages) Houston Academy of Medicine/Texas Medical Center Library November 1988-March 1989 When more doctors smoked Camels: Anti-smoking group looks at early cigaret ads (3 pages) Review by Steve Carroll American Medical News (published by the American Medical Association) June 23/30, 1989 Reviews of the updated version of the exhibition at the Reynolds Historical Library, University of Alabama at Birmingham, 2001 (4 pages) Cigarette ad exhibit tracks health claims, endorsements Review by Dave Parks The Birmingham News December 7, 2001 Ads laud When more doctors smoked Camels Review by Bob Shepard UAB Reporter (University of Alabama at Birmingham) December 17, 2001 Smokings stained history on show: Exhibit recaps a century of cigarette ads where even doctors indulged Review by Linda Long The Huntsville Times January 29, 2002 When More doctors smoked Camels: Cigarette advertising in the New York State Journal of Medicine (7 pages) Article by Alan Blum, MD

Terms That Indicate a Cleaner Paper Unbleached - no chlorine or chemical whitening agents used Natural gum / Acacia gum - plant-based, clean-burning adhesive Organic - base fibres grown without synthetic pesticides or fertilisers Additive-free - no burn regulators, artificial flavours, or chemical treatments beyond basic processing Vegan - no animal-derived ingredients in the gum or processing agents Terms That Should Prompt Caution No ingredient information at all - a brand that tells you nothing is not a brand worth trusting with your lungs Extra white / Ultra white - purely aesthetic descriptors that often indicate heavy bleaching Flavoured - fine occasionally, but check whether natural or artificial flavouring is used Fast burning - usually means burn accelerants have been added, which are chemical additives 6
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