Frequencies for first 10,000 rows of cig2_r variable in natl2017 dataset :

 Cigarettes |
        2nd |
  Trimester |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,934       89.34       89.34
          1 |        438        4.38       93.72
          2 |        278        2.78       96.50
          3 |         78        0.78       97.28
          4 |         28        0.28       97.56
          5 |          8        0.08       97.64
          6 |        236        2.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018