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5 F,
and flerelpmot
TO 'DR. S.J. GREEN FROM D.J. WOOD
MILLBANK
V
REF DJW/JP/46D DATE 18th May, 1977
REPORT NO. RD.1494 RESTRICTED
"ANALYSIS OF N'-NITROSONORNICOTINE
IN TOBACCO AND OTHER SMOKING MATERIALS"
This report describes a radiotracer method for the
analysis
of N'-nitrosonornicotine (NNN) in tobacco, and
gives results for
the amounts found in a restricted range of
tobaccos and other
smoking materials. According to our measurements
the major
portion of NNN which is found in smoke is due to
direct transfer
from the tobacco. This is somewhat different from
Hoffmann's
findings, who reported rather more than half the
NNN in smoke
as being formed during smoking. If our results
present a truer
picture the implication is that efforts to reduce
the amount of
NNN in smoke, other than by filtration, should
concentrate on
the tobacco rather than on the combustion process.
There is
evidence that some reduction can be achieved by
reconstituting
tobacco into sheet.
I would suggest that copies of this report should
go to
Mr. Sheehy, Mr. Bowra and Mr. Walmisley.
Encs.
-2 c
cc~
BATCO document for Province of BritiSh Columbia 5
November 1999