cigarette history timeline Smoking - Health Risks, Addiction, The Evolution of E-Cigarettes &

However, due to the short half-life of CO (2 h), many people who smoked over 24 h before the test could be misclassified as quitters [5]

While the pack year history and quit date algorithms could not be formally tested in the i2b2 data due to a lack of annotations, we assessed the i2b2 test set using the full pipeline and identified both pack years and quit date

Cigarettes are made to light relatively easily, but they still need sustained heat rather than a brief spark

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