The most prevalent symptoms (Table 2) were feeling weak/tired, hypersomnia, yawning, psychomotor retardation, anxiety, and depressed mood. In the full sample of frequent cannabis users, 57.7% experienced ≥1 cannabis withdrawal symptom, 44.3% experienced ≥2 symptoms, and 34.4% experienced ≥3 symptoms. Among the subset of frequent cannabis users that did not abuse other substances, 59.4%, 44.2%, and 34.1% experienced ≥1, ≥2, and ≥3 cannabis withdrawal symptoms, respectively. Thus, a large proportion of frequent cannabis users experienced one or more of these symptoms, with little difference seen between those that used and did not use other substances. From a different perspective, among the entire NESARC sample, the prevalence of being a frequent cannabis user that experienced ≥3 cannabis withdrawal symptoms was 2.1% (SE=0.1). All symptoms were tested for differences in prevalence by age, sex, ethnicity and education. Only scattered symptoms were found to differ by these characteristics; in light of the number of tests run and exploratory nature of the tests, the few significant results did not appear to contribute substantially to our understanding of these symptoms.
