Codes and Frequencies
For sample adults who have smoked at least 100 cigarettes (SMOKEV) and do not currently smoke (SMOKFREQNOW), QUITTP reports a type of time period associated with a numerical response (QUITNO) that corresponds to the length of time since the person quit smoking cigarettes. Users should combine these two variables to determine the length of time since the person quit smoking cigarettes. Please see the universe tab for detailed information about who was asked this question.
Beginning in 2020, QUITTP was collected as part of the NHIS rotating core content on smoking history and cessation. For more information on the smoking history and cessation rotating core or other smoking history and cessation variables, please see SMOKAGEREG.
A major survey redesign introduced in 2019 affects comparability of data from 2019-forward with data from before 2019. There are also minor changes in the universe statement between years, as outlined in the Universe tab, which impact the comparability of this variable over time. Users are advised to consider the impact that changes in the universe may have on their analyses when using data from multiple years.
The NHIS questionnaire was substantially redesigned in 2019 to introduce a different data collection structure and new content. For more information on changes in terminology, universes, and data collection methods beginning in 2019, please see the user note.
- 1992: Half of sample persons age 18+ in quarters 1 and 2, and in 2 weeks of quarter 3 (excluded from CAEP supplement) who have smoked at least 100 cigarettes and either do not currently smoke or smoke some days but have not smoked in the past 30 days.
- 1994-1995: Half of sample persons age 18+ (excluded from AIDS supplement) who have smoked at least 100 cigarettes and don't currently smoke.
- 1997-2018: Sample adults age 18+ who have smoked at least 100 cigarettes and don't currently smoke.
- 2020: Sample adults age 18+ who have smoked at least 100 cigarettes (SMOKEV) and don't currently smoke (SMOKFREQNOW).
- 1992, 1994-1995, 1997-2018, 2020