Table 1.

Descriptive statistics for n=29 study participants.

Characteristics			Values
			Sustained users (n=13), n (%)		Short-term users (n=16), n (%)
Ethnicity
	Chinese	8 (62)		11 (69)
	Malay	2 (15)		1 (6)
	Indian	1 (8)		2 (13)
	Others	2 (15)		2 (13)
Education
	Technical or “O” levels equivalent	0 (0)		2 (13)
	Polytechnic or “A” levels equivalent	13 (100)		14 (88)
Smoking
	Non-smoker and ex-smoker	9 (69)		14 (88)
	Smoker	2 (15)		4 (25)