Table 4:

Factors associated with single and polytobacco use among current tobacco users in SUD treatment (N=368)

Factors	Single use vs. Dual use AOR (95%CI)	Poly use vs. Dual use AOR (95%CI)
Tobacco-related factors
Heaviness of smoking index	0.86 (0.66, 1.11)	1.37 (1.14, 1.65) ***
Past 30-day use of blunt/spliff	0.56 (0.20, 1.53)	1.65 (0.89, 3.06)
Ever using e-cigarette for quitting smoking	0.31 (0.18, 0.56) ***	1.43 (0.83, 2.46)
Having past-year quit attempts	0.80 (0.45, 1.43)	1.25 (0.62, 2.53)
Having plan to quit in next 30 days	0.85 (0.46, 1.57)	1.15 (0.47, 2.79)
Health-related factors
Physically unhealthy days	1.05 (1.01, 1.09) *	1.02 (0.96, 1.09)
Mentally unhealthy days	0.95 (0.93, 0.98) ***	0.98 (0.94, 1.03)
Covariates
Age	1.00 (0.98, 1.03)	0.98 (0.95, 1.00)
Gender (Ref=Male)
Female	2.18 (0.89, 5.30)	0.25 (0.09, 0.65) ***
Other	1.41 (0.74, 2.68)	1.52 (0.24, 9.57)
Race/Ethnicity (Ref = NH White)
NH Black	1.12 (0.59, 2.12)	0.52 (0.16, 1.69)
Hispanic	0.75 (0.32, 1.78)	0.47 (0.22, 1.01)
Other/Multi-race	0.71 (0.34, 1.50)	0.30 (0.14, 0.62) ***
Education (Ref = Less than High school)
High school or GED	0.63 (0.22, 1.77)	0.80 (0.26, 2.42)
More than High school	0.65 (0.24, 1.74)	0.42 (0.16, 1.09)
Time in treatment program	1.02 (1.01, 1.04) *	1.01 (0.98, 1.04)

Note:

^*: p<0.05

^**: p<0.01

^***: p<0.001;

AOR: Adjusted Odds Ratio; 95%CI: 95% Confidence Interval.

The multinomial model included all the variables. The outcome included 3 categories (single-, dual-, and polytobacco use) with dual tobacco use as a referent outcome.