The relationship between cannabis involvement and suicidal thoughts and behaviors
Published Date:Feb 26 2015
Source:Drug Alcohol Depend. 150:98-104.
Pubmed Central ID:PMC4460828
Funding:K02 DA032573/DA/NIDA NIH HHS/United States
DA32573/DA/NIDA NIH HHS/United States
P60 AA011998/AA/NIAAA NIH HHS/United States
P50 AA011998/AA/NIAAA NIH HHS/United States
R01 AA007728/AA/NIAAA NIH HHS/United States
F32 AA023693/AA/NIAAA NIH HHS/United States
DA12854/DA/NIDA NIH HHS/United States
R01 DA023668/DA/NIDA NIH HHS/United States
K21 DA000272/DA/NIDA NIH HHS/United States
R56 DA012854/DA/NIDA NIH HHS/United States
R01 AA013321/AA/NIAAA NIH HHS/United States
R01 DA018267/DA/NIDA NIH HHS/United States
AA07728/AA/NIAAA NIH HHS/United States
T32 DA007313/DA/NIDA NIH HHS/United States
F32 AA013221/AA/NIAAA NIH HHS/United States
AA11998/AA/NIAAA NIH HHS/United States
AA13221/AA/NIAAA NIH HHS/United States
R01 DA012854/DA/NIDA NIH HHS/United States
R37 AA007728/AA/NIAAA NIH HHS/United States
DA18267/DA/NIDA NIH HHS/United States
T32DA007313/DA/NIDA NIH HHS/United States
R49 CE001510/CE/NCIPC CDC HHS/United States
K21DA00272/DA/NIDA NIH HHS/United States
DA23668/DA/NIDA NIH HHS/United States
In the present study, we examined the relationship between cannabis involvement and suicidal ideation (SI), plan and attempt, differentiating the latter into planned and unplanned attempt, taking into account other substance involvement and psychopathology.
We used two community-based twin samples from the Australian Twin Registry, including 9,583 individuals (58.5% female, aged between 27 and 40). The Semi-Structured Assessment of the Genetics of Alcoholism (SSAGA) was used to assess cannabis involvement which was categorized into: (0) no cannabis use (reference category); (1) cannabis use only; (2) 1–2 cannabis use disorder symptoms; (3) 3 or more symptoms. Separate multinomial logistic regression analyses were conducted for SI and suicide attempt with or without a plan. Twin analyses examined the genetic overlap between cannabis involvement and SI.
All levels of cannabis involvement were related to SI, regardless of duration (Odds ratios [ORs] = 1.28 – 2.00, p < 0.01). Cannabis use and endorsing ≥3 symptoms were associated with unplanned (SANP; ORs = 1.95 and 2.51 respectively, p < 0.05), but not planned suicide attempts (p > 0.10). Associations persisted even after controlling for other psychiatric disorders and substance involvement. Overlapping genetic (rG=0.45) and environmental (rE=0.21) were responsible for the covariance between cannabis involvement and SI.
Cannabis involvement is associated, albeit modestly, with SI and unplanned suicide attempts. Such attempts are difficult to prevent and their association with cannabis use and cannabis use disorder symptoms requires further study, including in different samples and with additional attention to confounders.
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