Table 2.

Classification of dependence according to the Heaviness of Smoking Index (HSI score)

	A = 3 points (0–5 min)	B = 2 points (6–30 min)	C = 1 point (31–60 min)	D = 0 points (later)
A = 0 points (≤10)	4	8	6b	8b
B = 1 point (11–20)	15	10	9	3b
C = 2 points (21–30)	4a	5	-	-
D = 3 points (31 ≤)	2a	1a	-	-

The classification of dependence includes respondents using only acute-acting single-dose NRT. Patch, e-cigarette and inhaler users were omitted (n = 75). The time intervals in the columns indicate time to first NRT after waking. The intervals given in the rows indicate number of NRT doses per day.

^aHighly nicotine dependent respondents (score 5–6) = 9.3% (N = 7).

^bRespondents found low dependent on nicotine (score 0–1) = 22.7% (N = 17). Respondents moderately dependent on nicotine (score 2–4) = 68.0% (N = 51).