Inclusion Criteria: Adults aged 18 years and over. Estimates for which the relative standard error is <=30%.
Exclusion Criteria: 1. Persons under age 18 years. 2. Adults 18 years and over with cigarette smoking status unknown. 3. Non-cigarette tobacco use. 4. For educational status: persons under age 25 years. 5. Estimates for which the relative standard error is > 30%.
Estimates may have been suppressed if there were additional concerns over statistical reliability.
This measure is calculated by CDC/ National Center for Health Statistics (NCHS) with data from the National Health Interview Survey.