Survey Found Marijuana Use Was Linked to Suicidal Thoughts in Zambian Adolescents | Research

The takeaway

Among nearly 2,000 in-school Zambian adolescents, those who had ever used marijuana were more likely to report suicidal ideation in the past year, though the association was modest.

Read this if you're interested in the intersection of adolescent substance use and mental health, particularly in African contexts.

31.3% of Zambian students reported suicidal ideation; 35.9% had used marijuana

What the researchers found

Using data from the 2004 Zambia Global School-Based Health Survey, researchers analyzed responses from 1,970 in-school adolescents regarding suicidal ideation and behavioral risk factors.

Overall, 31.3% of students reported having seriously considered suicide in the past 12 months, with no significant difference between males (31.1%) and females (31.4%). A striking 35.9% reported having ever smoked marijuana.

In logistic regression analysis, ever having used marijuana was positively associated with suicidal ideation (OR=1.18, 95% CI 1.17-1.19). Other associated factors included having been drunk, feeling worried, and feeling sad or hopeless. Being male and being under 14 years old were also positively associated.

Unexpectedly, loneliness appeared protective (OR=0.92), which the authors noted was counterintuitive and may reflect methodological issues.

Why it matters

This study provided data from sub-Saharan Africa, a region underrepresented in cannabis and mental health research. The high rate of both suicidal ideation (31.3%) and marijuana use (35.9%) among Zambian school students highlights the scale of these issues in this population.

The numbers in context

1,970 adolescents surveyed. 31.3% reported suicidal ideation in past 12 months. 35.9% had ever used marijuana. 40.8% were current drinkers. Marijuana association with suicidal ideation: OR=1.18 (95% CI 1.17-1.19). Alcohol intoxication: OR=1.28.

How the study worked

Cross-sectional analysis of the 2004 Zambia Global School-Based Health Survey, a school-based self-report questionnaire administered to 1,970 adolescents. Backward logistic regression was used to assess associations between risk factors and suicidal ideation.

What this study cannot tell us

Cross-sectional design cannot determine whether marijuana use contributes to suicidal ideation or whether both share common underlying causes. Self-report data from adolescents may be unreliable. The "ever used" marijuana measure doesn't capture frequency or recency. Non-response bias may affect the suicidal ideation results.

How to read the evidence

This is a cross-sectional survey with a large sample but self-reported data and no ability to establish causation. The narrow confidence intervals suggest statistical precision but not causal certainty.

When this study was published

Published in 2007 using 2004 survey data. Subsequent Global School-Based Health Surveys have continued to monitor these trends across African countries.

The bigger picture

This study contributed to the global evidence base linking substance use and suicidal ideation in adolescents. The relatively modest association between marijuana use and suicidal thoughts (OR=1.18) was smaller than the association with alcohol intoxication (OR=1.28), providing context for the relative contributions of different substances.

Questions still open

Does the association between marijuana use and suicidal ideation persist after controlling for additional confounders like family environment and trauma? Are these patterns similar in other African countries?

Common questions

Does marijuana cause suicidal thoughts?

This study found an association but cannot determine causation. It is possible that marijuana use contributes to suicidal ideation, that suicidal ideation leads to marijuana use as self-medication, or that both are driven by shared factors like adversity or mental health conditions.

Why was the suicidal ideation rate so high?

The 31.3% rate reflects a broad survey question about whether students "seriously considered" suicide in the past year. Rates of actual suicide attempts would be substantially lower. Adolescent populations globally report relatively high rates of suicidal ideation on anonymous surveys.

Read the original research

Suicidal ideation and associated factors among in-school adolescents in Zambia.

Tanzania health research bulletin, 9(3), 202-6

View on PubMed ↗

Citation

Muula, A S; Kazembe, L N; Rudatsikira, E; Siziya, S. (2007). Suicidal ideation and associated factors among in-school adolescents in Zambia.. Tanzania health research bulletin, 9(3), 202-6.