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. 2017 Jul 4;4:170077. doi: 10.1038/sdata.2017.77

Table 3. Terminology classification for tobacco users.

Tobacco user category Description
Never-smoker Refers to those who smoked <100 cigarettes in their lifetime and who, at the time of the diagnosis, did not smoke at all.
Former smoker Refers to those who quit smoking for at least 1 year
Current smoker Refers to those who were still smoking around the time of diagnosis.