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I then add up the time and am able to compare models with concrete data

Results from a controlled study

Adult smokers who like fruit flavour, flavoured cigarettes, slim cigarettes, compact packs, or specialty cigarette formats

It's the equivalent of 90 packs of cigarettes

According to research on tobacco composition, tobacco and tobacco smoke contain a complex mixture of over 9,500 chemical compounds, with components generally classified as hydrocarbons (0.71%), oxygen-containing components (75.70%), nitrogen-containing components (12.98%), and miscellaneous components (10.61%)

Econometric Analysis of Cross Section and Panel Data