Table 4.

Perception of e-cigarettes and support for e-cigarette use regulation by ever use of e-cigarettes among respondents who had heard of e-cigarettes in Shanghai, China, 2019 (N=1896)

Items	Ever use of e-cigarettes (N=117)		Never use of e-cigarettes (N=1779)		Total		p
	% (95% CI)
Perceived harmfulness compared with traditional cigarettes
E-cigarettes less harmful	54.5	44.2–64.8	36.8	32.8–40.8	38.2	34.4–42.0	0.006
E-cigarettes similarly harmful	22.5	13.8–31.3	25.0	21.9–28.1	24.8	21.9–27.8
E-cigarettes more harmful	7.9	2.9–12.8	9.9	7.8–12.0	9.7	7.9–11.6
Do not know	15.1	7.3–22.9	28.3	24.9–31.6	27.2	24.1–30.3
Support to incorporate e-cigarettes into Regulation of Shanghai Municipality on smoking control
Support	81.0	71.0–90.9	86.1	83.5–88.6	85.7	83.2–88.2	0.264
Do not support/do not know	19.0	9.1–29.0	13.9	11.4–16.5	14.3	11.8–16.8