arguments with a spouse about consequences of intoxication; physical fights).
7. Important social, occupational, or recreat ional activities are given up or reduced be-
cause of phencyclidine use.
8. Recurrent phencyclidine use in situations in which it is physically hazardous (e.g.,
driving an automobile or operating a machine when impaired by a phencyclidine). 
9. Phencyclidine use is continued despite knowledge of having a persistent or recur-
rent physical or psychological problem that is likely to have been caused or exac-
erbated by the phencyclidine.
10. Tolerance, as defined by either of the following: 
a. A need for markedly increased amounts of the phencyclidine to achieve intoxi-
cation or desired effect.
b. A markedly diminished effect with continued use of the same amount of the
phencyclidine.