Table 2.

Individual participant characteristics.

Participant ID	Age	Ethnicity	Smoking Status at End of Pregnancy	Vaping Status at End of Pregnancy	EC Use * Mean (SD) Days
Woman1	23	White British	Smoking	Vaping	7.0 (0)
Woman2	25	White British	Smoking	Vaping	Not known
Woman3	31	White British	Abstinent	Vaping	7.0 (0)
Woman4	29	White British	Smoking	Not vaping	7.0 (0)
Woman5	37	White British	Smoking	Vaping	5.8 (2.50)
Woman6	24	White British	Abstinent	Vaping	5.3 (2.06)
Woman7	31	White European	Smoking	Vaping	7.0 (0)
Woman8	18	White British	Smoking	Vaping	7.0 (0)
Woman9	33	White British	Smoking	Vaping	5.8 (2.5)
Woman10	32	White British	Smoking	Vaping	7.0 (0)
Woman11	27	White British	Smoking	Vaping	7.0 (0)
Woman12	25	White British	Smoking	Vaping	6.5 (1.00)
Woman13	39	Black British	Abstinent	Vaping	7.0 (0)
Woman14	29	White British	Smoking	Vaping	Not known
Woman15	27	White British	Smoking	Vaping	7.0 (0)
Woman16	48	White British	Abstinent	Vaping	7.0 (0)
Woman17	29	White British	Smoking	Vaping	3.0 (2.94)
Woman18	20	White British	Smoking	Vaping	7.0 (0)
Women19	20	White British	Smoking	Vaping	7.0 (0)
Woman20	25	White British	Smoking	Vaping	7.0 (0)
Woman21	40	White British	Abstinent	Vaping	7.0 (0)
Women22	26	White British	Abstinent	Vaping	7.0 (0)
Woman23	29	White British	Smoking	Vaping	Not known
Woman24	30	White British	Abstinent	Vaping	7.0 (0)
Woman25	32	Asian British	Smoking	Vaping	7.0 (0)
Woman26	21	White British	Smoking	Vaping	6.7 (0.58)
Woman27	23	White British	Abstinent	Vaping	7.0 (0)
Woman28	28	White British	Smoking	Vaping	7.0 (0)

* EC use = mean (SD) number of days a week that women vaped over the first four weeks after the quit date. For women 7, 10, 25 and 26, data was available for three weeks and has been calculated over this time frame.