# Smoking Index

*From*: "Dr. Nezhat" <nshakeri@xxxxxxxxx>*Date*: Tue, 11 Nov 2008 02:12:32 -0800 (PST)

Smoking index is generally defined as the number of cigarette-years

(or pack-years) smoked. This ignores the parameters such as age at

initiation, time elapsed since cessation in case of ex-smokers,

passive smoking and other forms of smoking such as cigars and pipes.

The burden of smoking in a person depends on all these and much more.

While trying to locate a comprehensive index, the only one I could

find is the one given by Indrayan on pages 228-230 of his book Medical

Biostatistics, Second Edition, (Chapman & Hall/CRCPress). He

defines:

Smoking index, S = (3 - a/15)[1/2 sq.root(sum of psubk*nsubk*xsubk) -

y]

(S=0 for S<0),

where a= age at initiation in years; a=30 for a>30;

psubk=adjustment for the type of smoking for xsubk years; (Suggested

values are psubk= 1 for regular cigarette, psubk = 0.67 for filter

cigarette, psubk= 0.15 for passive smoking, psubk= 5.0 for cigar and

psubk= 2.5 for pipe)

nsubk= number of cigarettes (or others) smoked per day;

xsubk=number of years of specified smoking;

y=number of years elapsed since quitting.

Indrayan’s smoking index is more comprehensive than any other I could

locate but is based on several assumptions and lack validation.

Does anyone know or can provide a reference for more comprehensive

index of smoking which is validated for a variety of setups?

Nezhat Shakeri

.

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