Frequencies for first 10,000 rows of cig_0 variable in natlterr2014 dataset :

 Cigarettes |
     Before |
  Pregnancy |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,456       84.56       84.56
          1 |         12        0.12       84.68
          2 |         28        0.28       84.96
          3 |         24        0.24       85.20
          4 |         25        0.25       85.45
          5 |         44        0.44       85.89
          6 |         20        0.20       86.09
          7 |         17        0.17       86.26
          8 |          8        0.08       86.34
          9 |          1        0.01       86.35
         10 |        105        1.05       87.40
         12 |          8        0.08       87.48
         13 |          1        0.01       87.49
         15 |          5        0.05       87.54
         20 |         67        0.67       88.21
         22 |          1        0.01       88.22
         30 |          2        0.02       88.24
         40 |          5        0.05       88.29
         99 |         94        0.94       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016