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SW: →Use of diammonium phosphate to manipulate nicotine impact: work in progress.
Philip Morris, BAT and [[R.J. Reynolds]] soon found that when applied to certain types of strong, harsh tobaccos, the application of DAP toned down harshness in the tobacco and led to higher-than-expected nicotine impact due to improved nicotine transfer into smoke, and greater proportions of nicotine in freebase (or "extractable") form. <ref>M.Coleman, British American Tobacco [http://legacy.library.ucsf.edu/tid/fji74a99 Report on Root technology] Report. 47 pp. November 26, 1991. Bates No. 402444072/4118</ref>
In 1973, RJR chemically analyzed competing brands of cigarettes that were excelling in sales to see how they differed from RJR's products. They found that the smoke from these other products (specifically Marlboro and Kool) was more alkaline, and that this caused more of the nicotine to go into "free" form (vapor form), "which is volatile, rapidly absorbed by the smoker and believe to be instantly perceived as nicotine 'kick.' " RJR correlated the difference in smoke pH with improved market performance of these brands, saying
<blockquote>Our preliminary correlations strongly suggest that ... the vigorous, sustained growth in sales of Marlboro (and other Philip Morris brands) and Kool correlates closely with the increased smoke pH, hence increased 'free' nicotine and nicotine impact of those brands.<ref>Claued E. Teague, Jr., R.J. Reynolds [http://legacy.library.ucsf.edu/tid/tlr59d00 Implications and Activities Arising From Correlation of Smoke Ph with Nicotine Impact, Other Smoke Qualities, and Cigarette Sales.] Scientific report. 29 pages. October, 1993. Bates No. 500917506/7534</ref> </blockquote>
The name for this chemical process is "free basing," the same term used to describe a process drug abusers apply to cocaine to yield a more rapid, intense onset of the drug's effects.<ref> [http://en.wikipedia.org/wiki/Freebase_(chemistry) Wikipedia page on Freebase chemistry], accessed February 4, 2009</ref>
==R.J. Reynolds' "REST Process"==
