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In the VHLSSs before 2010, households were asked for total tobacco expenditure in the past 12 months, while in the VHLSSs since 2010 households were asked for tobacco expenditure from the last 30 days, which is then multiplied by 12 to estimate annual tobacco expenditure
Caruso M, Distefano A, Emma R, Zuccarello P, Copat C, Ferrante M, et al
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They matched people who had quit smoking with continuing smokers according to their starting cognitive scores and other characteristics, including sex, age, education level and birth country
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