Frequencies for first 10,000 rows of cig_0 variable in natl2016 dataset :

 Cigarettes |
     Before |
  Pregnancy |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,325       83.25       83.25
          1 |         30        0.30       83.55
          2 |         60        0.60       84.15
          3 |         99        0.99       85.14
          4 |         91        0.91       86.05
          5 |        160        1.60       87.65
          6 |         78        0.78       88.43
          7 |         49        0.49       88.92
          8 |         35        0.35       89.27
          9 |         10        0.10       89.37
         10 |        306        3.06       92.43
         11 |          1        0.01       92.44
         12 |         18        0.18       92.62
         13 |          1        0.01       92.63
         14 |          1        0.01       92.64
         15 |         34        0.34       92.98
         16 |          3        0.03       93.01
         18 |          1        0.01       93.02
         19 |          1        0.01       93.03
         20 |        290        2.90       95.93
         21 |          1        0.01       95.94
         22 |          1        0.01       95.95
         23 |          1        0.01       95.96
         24 |          5        0.05       96.01
         25 |          9        0.09       96.10
         27 |          2        0.02       96.12
         30 |         30        0.30       96.42
         31 |          1        0.01       96.43
         35 |          4        0.04       96.47
         37 |          1        0.01       96.48
         40 |         46        0.46       96.94
         48 |          1        0.01       96.95
         51 |          1        0.01       96.96
         60 |          8        0.08       97.04
         80 |         19        0.19       97.23
         98 |          3        0.03       97.26
         99 |        274        2.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017