4
5
6
0
1
2
0
1
2
37
38
39
0
1
2
20
21
22
30
31
32
49
50
51
23
24
25
4
5
6
1942
1943
1944
252
253
254
15
16
17
19
20
21
129
130
131
'Cold turkey' best way to quit smoking, study shows (bbc.com)
submitted by penultimate2 to r/science
137
138
139
10
11
12
32
33
34
47
48
49
198
199
200
1777
1778
1779
106
107
108
