Frequencies for first 10,000 rows of cigs variable in natl2007 dataset :

 Cigarettes |
  Per Day U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,402       84.02       84.02
          1 |         93        0.93       84.95
          2 |        126        1.26       86.21
          3 |        170        1.70       87.91
          4 |        112        1.12       89.03
          5 |        280        2.80       91.83
          6 |         68        0.68       92.51
          7 |         66        0.66       93.17
          8 |         38        0.38       93.55
          9 |          9        0.09       93.64
         10 |        318        3.18       96.82
         11 |          2        0.02       96.84
         12 |         19        0.19       97.03
         13 |          2        0.02       97.05
         14 |          1        0.01       97.06
         15 |         41        0.41       97.47
         16 |          1        0.01       97.48
         17 |          2        0.02       97.50
         20 |         64        0.64       98.14
         21 |          1        0.01       98.15
         23 |          1        0.01       98.16
         30 |          2        0.02       98.18
         35 |          1        0.01       98.19
         99 |        181        1.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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