Table 1.

Distribution of cohort by quitting status at each of three waves

Quitting status	W1	W2	W3	W1 to W3 sample, n (%)	W2 to W4 sample, n (%)
Continuing smokers	Smoking	Smoking and no quit attempt since previous wave	Smoking and no quit attempt since previous wave	2730 (90.8)	2186 (87.7)
Successful quitters	Smoking	Quit at time of survey for at least 30 days	Remained quit from time of previous wave	170 (5.7)	221 (8.9)
Failed quitters	Smoking	Quit at time of survey for at least 30 days	Relapsed back to smoking at time of survey	105 (3.5)	86 (3.4)
			Total	3005	2493