Frequencies for first 10,000 rows of cig_1 variable in natl2015 dataset :

 Cigarettes |
        1st |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,442       84.42       84.42
          1 |         49        0.49       84.91
          2 |         74        0.74       85.65
          3 |        127        1.27       86.92
          4 |         86        0.86       87.78
          5 |        179        1.79       89.57
          6 |         62        0.62       90.19
          7 |         43        0.43       90.62
          8 |         42        0.42       91.04
          9 |          6        0.06       91.10
         10 |        288        2.88       93.98
         12 |          8        0.08       94.06
         14 |          1        0.01       94.07
         15 |         30        0.30       94.37
         16 |          1        0.01       94.38
         17 |          1        0.01       94.39
         18 |          2        0.02       94.41
         19 |          1        0.01       94.42
         20 |        121        1.21       95.63
         23 |          1        0.01       95.64
         24 |          3        0.03       95.67
         26 |          1        0.01       95.68
         30 |          4        0.04       95.72
         31 |          1        0.01       95.73
         40 |          6        0.06       95.79
         60 |          2        0.02       95.81
         80 |         10        0.10       95.91
         99 |        409        4.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016