PubMed IDSmoking initiationSmkInitWhether someone has ever been a regular smoker.36477530Cigarettes per dayCPDNumber of cigarettes smoked per day.36477530Fagerström Test for Nicotine DependenceFTNDA six-item questionnaire assessing quantity of cigarettes smoked and compulsion to use, resulting in an ordinal measure of nicotine dependence.33144568Tobacco use disorderICD-TUDBinary diagnosis defined using International Classification of Disease (ICD) codes (ICD 10 code F17.200; F17.200).38632388Nicotine dependenceDSM-NicDepSeven criteria designed to assess clinical features of dependence. Including distress and problems caused by using cigarettes, at least 3 of the 7 criteria must be endorsed to reach a diagnosis of nicotine dependence.NAProblematic tobacco usePTUA combination of FTND and CPD GWAS, produced using multi-trait analysis of GWAS.34750568
