Usage de drogues parmi les lyceens americains

source : http://nces.ed.gov/pubs/yi/y9649a.html


Tobacco, alcohol, and drug use among high school seniors, by substance 
and frequency of use: 1975 to 1994 

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        Substance         Class  Class  Class   Class  Class  Class  Class  Class
      and frequency         of     of     of      of     of     of     of     of
         of use            1975   1980   1985    1990   1991   1992   1993   1994
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                                  Percent reporting having ever used drugs

Cigarettes ............    73.6   71.0   68.8    64.4   63.1   61.8   61.9   62.0
Alcohol\1\ ............... 90.4   93.2   92.2    89.5   88.0   87.5   80.0   80.4
Any illicit drug ......... 55.2   65.4   60.6    47.9   44.1   40.7   42.9   45.6
  Marijuana only ......... 19.0   26.7   20.9    18.5   17.2   15.6   16.2   18.0
  Any illicit drug other
   than marijuana\2\ ..... 36.2   38.7   39.7    29.4   26.9   25.1   26.7   27.6

Selected illicit drugs:
  Cocaine ................  9.0   15.7   17.3     9.4    7.8    6.1    6.1    5.9
  Heroin .................  2.2    1.1    1.2     1.3    0.9    1.2    1.1    1.2
  LSD .................... 11.3    9.3    7.5     8.7    8.8    8.6   10.3   10.5
  Marijuana/hashish ...... 47.3   60.3   54.2    40.7   36.7   32.6   35.3   38.2
  PCP ....................  ---    9.6    4.9     2.8    2.9    2.4    2.9    2.8

                           Percent reporting use of drugs in the previous 30 days

Cigarettes ............... 36.7   30.5   30.1    29.4   28.3   27.8   29.9   31.2
Alcohol\1\ ............... 68.2   72.0   65.9    57.1   54.0   51.3   48.6   50.1
Any illicit drug ......... 30.7   37.2   29.7    17.2   16.4   14.4   18.3   21.9
  Marijuana only ......... 15.3   18.8   14.8     9.2    9.3    8.1   10.4   13.1
  Any illicit drug other
   than marijuana\2\ ..... 15.4   18.4   14.9     8.0    7.1    6.3    7.9    8.8

Selected illicit drugs:
  Cocaine ................  1.9    5.2    6.7     1.9    1.4    1.3    1.3    1.5
  Heroin .................  0.4    0.2    0.3     0.2    0.2    0.3    0.2    0.3
  LSD ....................  2.3    2.3    1.6     1.9    1.9    2.0    2.4    2.6
  Marijuana/hashish ...... 27.1   33.7   25.7    14.0   13.8   11.9   15.5   19.0
  PCP ....................  ---    1.4    1.6     0.4    0.5    0.6    1.0    0.7
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