The Report of the National Commission on Marihuana and Drug Abuse
Acute Effects of Marihuana
(Delta 9 THC)
PERSISTENT EFFECTS AFTER ACUTE DOSE
Investigators have not noted persistent effects after smoking marihuana for periods of
more than three to five hours (Fink et al., 1971; Weil et al., 1968; Pillard, 1970).
Users report only minimal hangover effects (Mayor's Committee, 1944; Haines and Green,
1970; McGlothlin et al., 1971) after very heavy use. Feelings of lassitude and heaviness
of the head, lethargy, irritability, headaches and loss of concentration are reported
especially when associated with lack of sleep (Chopra and Chopra, 1939; Indian Hemp,
1893). This may be related to preliminary data (Rickles et al., 1970) suggesting a subtle
increase in REM sleep time primarily seen in the last one-third of the night in
individuals who smoked one to two cigarettes per day usually at night for at least a year.
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