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Table 3 Frequencies of “most important” negative health effects associated with cannabis use reported by Canadian youth and young adults (N = 870)

From: Cannabis health knowledge and risk perceptions among Canadian youth and young adults

  % (N)
Physical concerns
 Decreased brain function, cognitive abilities 24.7 (215)
 Respiratory function 23.8 (207)
 Addiction 16.4 (143)
 Carcinogenic 9.7 (84)
 Harmful effects from smoking 7.2 (63)
 Hunger/“munchies” 6.7 (58)
 Drowsiness 6.1 (53)
 General detriment to health 5.4 (47)
 Issues with circulation, heart palpitations 5.3 (46)
 Dry mouth 3.6 (31)
 Youth health, developmental concerns 3.0 (26)
 Bad/“gross” smell 2.6 (23)
 Drug interactions, concerns about tainted product 2.1 (18)
 Obesity 2.0 (17)
 Dizziness 1.8 (16)
 Nausea 1.6 (14)
 Red eyes 1.5 (13)
 Vision problems 1.4 (12)
 Sexual health 1.4 (12)
 Death 1.1 (10)
Psychological Concerns   
 Reaction time related to driving or other activities 9.3 (81)
 Mental health issues 9.3 (81)
 Judgment/Inhibition issues 8.5 (74)
 Memory loss 8.4 (73)
 Loss of motivation 7.5 (65)
 Anxiety/panic 5.5 (48)
 Depression 3.7 (32)
 Hallucinations 3.7 (32)
 Loss of concentration 3.7 (32)
 Paranoia 3.4 (30)
 Being high 1.6 (14)
 Schizophrenia 1.1 (10)
 Psychosis 1.1 (10)
Social concerns   
 Gateway drug 1.7 (15)
 Behavioural changes 1.5 (13)
 Money problems 1.0 (9)
Do not know/refused   
 Do not know 10.0 (87)
 Refused 1.7 (15)
  1. *Concerns accounting for < 1% of overall responses are omitted here