Frequencies for first 10,000 rows of cig1_r variable in natlterr2014 dataset :

 Cigarettes |
        1st |
  Trimester |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,561       85.61       85.61
          1 |         96        0.96       86.57
          2 |        123        1.23       87.80
          3 |         35        0.35       88.15
          4 |          4        0.04       88.19
          5 |          2        0.02       88.21
          6 |        102        1.02       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016