Table 4. Association Between Frequency of E-Cigarette Use and Tobacco Company Promotions Received in Previous 6 Months Among US Adults Who Were Current Users, National Adult Tobacco Survey, 2013–2014^a .

Variable	Frequency
	Some Days		Every Day
	Adjusted Odds Ratio (95% Confidence Interval)	P Value	Adjusted Odds Ratio (95% Confidence Interval)	P Value
Mail promotion
No	1 [Reference]		1 [Reference]
Yes	1.5 (1.0-2.3)	.07	1.7 (1.0–2.7)	.04
Email promotion
No	1 [Reference]		1 [Reference]
Yes	1.5 (1.1–2.2)	.03	2.0 (1.4–3.0)	<.001
Mail or email promotion
No	1 [Reference]		1 [Reference]
Yes	1.6 (1.1–2.2)	.006	1.7 (1.2–2.4)	.008
Mail and email promotion
Single promotion	1 [Reference]		1 [Reference]
Both promotions	1.2 (0.6–2.5)	.56	3.1 (1.5–6.6)	.003

^a Adjusted odds ratios for use of e-cigarettes on some days and every day are in reference to “rarely” use e-cigarettes. Adjusted odds ratios are adjusted by all covariates in the study, including sex, age, race/ethnicity, education, income, smoking rules, housing unit type, and whether respondents intentionally submitted their mail addresses to e-cigarette manufacturers.