Frequencies for first 10,000 rows of cig_0 variable in natlterr2015 dataset :

 Cigarettes |
     Before |
  Pregnancy |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,463       84.63       84.63
          1 |         16        0.16       84.79
          2 |         36        0.36       85.15
          3 |         30        0.30       85.45
          4 |         24        0.24       85.69
          5 |         48        0.48       86.17
          6 |         14        0.14       86.31
          7 |         12        0.12       86.43
          8 |          5        0.05       86.48
          9 |          2        0.02       86.50
         10 |         76        0.76       87.26
         12 |          3        0.03       87.29
         14 |          1        0.01       87.30
         15 |          7        0.07       87.37
         17 |          1        0.01       87.38
         18 |          1        0.01       87.39
         20 |         58        0.58       87.97
         25 |          1        0.01       87.98
         36 |          1        0.01       87.99
         40 |          5        0.05       88.04
         60 |          2        0.02       88.06
         80 |          1        0.01       88.07
         99 |        115        1.15       89.22
          . |      1,078       10.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016