Frequencies for first 10,000 rows of cig_1 variable in natl2016 dataset :

 Cigarettes |
        1st |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,673       86.73       86.73
          1 |         31        0.31       87.04
          2 |         77        0.77       87.81
          3 |        110        1.10       88.91
          4 |         82        0.82       89.73
          5 |        170        1.70       91.43
          6 |         55        0.55       91.98
          7 |         48        0.48       92.46
          8 |         30        0.30       92.76
          9 |          7        0.07       92.83
         10 |        237        2.37       95.20
         12 |         11        0.11       95.31
         13 |          1        0.01       95.32
         14 |          1        0.01       95.33
         15 |         30        0.30       95.63
         16 |          1        0.01       95.64
         17 |          2        0.02       95.66
         18 |          1        0.01       95.67
         20 |        122        1.22       96.89
         22 |          4        0.04       96.93
         24 |          2        0.02       96.95
         25 |          2        0.02       96.97
         27 |          2        0.02       96.99
         30 |          7        0.07       97.06
         35 |          2        0.02       97.08
         40 |         12        0.12       97.20
         48 |          1        0.01       97.21
         60 |          5        0.05       97.26
         80 |          6        0.06       97.32
         98 |          1        0.01       97.33
         99 |        267        2.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017