Frequencies for first 10,000 rows of cigs variable in natl2005 dataset :

 Cigarettes |
  Per Day U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,365       83.65       83.65
          1 |         70        0.70       84.35
          2 |        153        1.53       85.88
          3 |        168        1.68       87.56
          4 |        116        1.16       88.72
          5 |        270        2.70       91.42
          6 |         86        0.86       92.28
          7 |         62        0.62       92.90
          8 |         45        0.45       93.35
          9 |         11        0.11       93.46
         10 |        354        3.54       97.00
         12 |         18        0.18       97.18
         13 |          3        0.03       97.21
         14 |          1        0.01       97.22
         15 |         37        0.37       97.59
         20 |         64        0.64       98.23
         21 |          1        0.01       98.24
         22 |          1        0.01       98.25
         24 |          1        0.01       98.26
         25 |          2        0.02       98.28
         30 |          3        0.03       98.31
         40 |          1        0.01       98.32
         99 |        168        1.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015