Frequencies for first 10,000 rows of cigs variable in natl2004 dataset :

 Cigarettes |
  Per Day U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,316       83.16       83.16
          1 |         68        0.68       83.84
          2 |        118        1.18       85.02
          3 |        175        1.75       86.77
          4 |        107        1.07       87.84
          5 |        269        2.69       90.53
          6 |        101        1.01       91.54
          7 |         63        0.63       92.17
          8 |         47        0.47       92.64
          9 |          6        0.06       92.70
         10 |        345        3.45       96.15
         11 |          2        0.02       96.17
         12 |          9        0.09       96.26
         13 |          1        0.01       96.27
         14 |          4        0.04       96.31
         15 |         41        0.41       96.72
         16 |          1        0.01       96.73
         18 |          1        0.01       96.74
         20 |        103        1.03       97.77
         21 |          2        0.02       97.79
         24 |          1        0.01       97.80
         25 |          1        0.01       97.81
         30 |          3        0.03       97.84
         40 |          3        0.03       97.87
         99 |        213        2.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016