The British Journal of Psychiatry 132: 482-486 (1978)
© 1978 The Royal College of Psychiatrists
Some psychological correlates of long-term heavy cannabis users
SS Menhiratta, NN Wig and SK Verma
Fifty persons who had all been heavy cannabis users for a long time were
given psychological tests measuring psychomotor, perceptual and other
variables. Half of these persons were "Charas" smokers, half "Bhang"
drinkers. The duration of cannabis use was 4--10 years, with an average
daily dose of 150 mg tetrahydrocannabinol. A matched control group of
twenty-five persons were given the same tests. Compared with this group,
the cannabis users were found to react more slowly, to be poorer in
concentration and time estimation, to have higher neuroticism and greater
perceptuo-motor disturbance. The higher neuroticism and greater
perceptuo-motor disturbance. The Charas smokers were the poorest performers
and also showed poor memory, lowered psychomotor activity, and poor size
estimation.