Frequencies for first 10,000 rows of cig_3 variable in natl2017 dataset :

 Cigarettes |
        3rd |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,981       89.81       89.81
          1 |         72        0.72       90.53
          2 |         87        0.87       91.40
          3 |        103        1.03       92.43
          4 |         77        0.77       93.20
          5 |        147        1.47       94.67
          6 |         41        0.41       95.08
          7 |         27        0.27       95.35
          8 |         22        0.22       95.57
          9 |          2        0.02       95.59
         10 |        116        1.16       96.75
         11 |          2        0.02       96.77
         12 |          6        0.06       96.83
         14 |          3        0.03       96.86
         15 |         10        0.10       96.96
         20 |         44        0.44       97.40
         21 |          1        0.01       97.41
         22 |          3        0.03       97.44
         23 |          4        0.04       97.48
         24 |          3        0.03       97.51
         25 |          5        0.05       97.56
         30 |          4        0.04       97.60
         35 |          1        0.01       97.61
         40 |          4        0.04       97.65
         70 |          1        0.01       97.66
         80 |          5        0.05       97.71
         99 |        229        2.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018