Table 3. All-Cause Mortality Risk by Years Since Cessation Among Former Daily and Nondaily Smokers Compared With Risk Among Never Smokers^a.

No. of years since quitting	Total No.b	Deaths, No.	HR (95% CI)c
Never smoker	281 000	20 500	1 [Reference]
Former daily smoker
<2	5900	750	2.18 (2.03-2.35)
2 to <5	8900	1100	1.96 (1.84-2.08)
5 to <10	11 000	1500	1.69 (1.60-1.78)
≥10	44 500	7900	1.18 (1.15-1.22)
Former nondaily smoker
<2	1100	50	1.20 (0.91-1.59)
2 to <5	1600	100	1.57 (1.29-1.90)
5 to <10	1900	100	1.36 (1.14-1.63)
≥10	10 500	1300	1.09 (1.04-1.15)

Abbreviations: DRB, Disclosure Review Board; HR, hazard ratio.

^aUS Census Bureau’s DRB release number CBDRB-FY19-262.

^bUnweighted numbers were rounded following the disclosure avoidance guidelines by the US Census Bureau’s DRB: if the number is less than 15, report it; if the number is between 15 and 99, round to the nearest 10; if the number is between 100 and 999, round to the nearest 50; if the number is between 1000 and 9999, round to the nearest 100; if the number is between 10 000 and 99 999, round to the nearest 500; if the number is between 100 000 and 999 999, round to the nearest 1000; and if the number is 1 000 000 or more, round to 4 significant digits.

^cAdjusted for sex, race/ethnicity (non-Hispanic white, non-Hispanic black, Hispanic, and non-Hispanic other), education (<high school, high school, some college, and college), survey year (1992-1993, 1995-1996/1998-1999, 2000/2001-2002/2003, 2006-2007, and 2010-2011), and ratio of standardized income to the poverty level (<50%, 50% to <100%, 100% to <200%, 200% to <400%, ≥400%, and missing).