Frequencies for first 10,000 rows of cigs variable in natlterr2007 dataset :

 Cigarettes |
  Per Day U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,252       42.52       42.52
          1 |         36        0.36       42.88
          2 |         20        0.20       43.08
          3 |         24        0.24       43.32
          4 |         25        0.25       43.57
          5 |         38        0.38       43.95
          6 |         18        0.18       44.13
          7 |          5        0.05       44.18
          8 |          9        0.09       44.27
         10 |        120        1.20       45.47
         12 |          1        0.01       45.48
         15 |          4        0.04       45.52
         16 |          1        0.01       45.53
         20 |         28        0.28       45.81
         25 |          1        0.01       45.82
         30 |          4        0.04       45.86
         40 |          1        0.01       45.87
         99 |      1,576       15.76       61.63
          . |      3,837       38.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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