Table 2

E-cigarette use at the age of 19 years in relation to smoking, use of snus and parental tobacco use at age 14–15 years*

	Ever tried/used e-cigarettes			Current e-cigarette use
	n	%	P value	n	%	P value
Smoking at age 14–15 years
Never	364/1910	19.1		61/1910	3.2
Occasionally	50/147	34.0		11/147	7.5
Daily	39/64	60.9	<0.001	18/64	28.1	<0.001
Use of snus at age 14–15 years
Never	405/2035	19.9		76/2035	3.7
Occasionally	16/28	57.1		5/28	17.9
Daily	31/61	50.8	<0.001	9/61	14.8	<0.001
Parental smoking at age 14–15 years
Father smoker, no	374/1835	20.4		69/1835	3.8
yes	72/253	28.5	0.003	20/253	7.9	0.002
Mother smoker, no	368/1832	20.1		73/1832	4.0
yes	76/256	29.7	<0.001	16/256	6.3	0.093

*Individuals with missing answers in the individual questions about tobacco use and e-cigarette use were excluded from the analysis.
e-cigarette, electronic cigarette.