The "7-fold suicide risk" claim

The most alarming number in the campaign to ban legal cannabis in Texas is a single line that shows up in advocate bios and legislative testimony: that marijuana raises the risk of suicide “by 7-fold.” It is a frightening figure. It is also a distortion of the study it comes from.

Where the number comes from

The figure traces to a 2014 analysis published in Lancet Psychiatry (Silins and colleagues), which pooled data from several long-running studies that followed young people over time. The specific result that gets quoted is a roughly seven-fold increase in the odds of a suicide attempt among the heaviest adolescent users.

Three qualifiers get dropped every time the number is repeated.

It measured attempts, not deaths. A suicide attempt and a completed suicide are not the same event, and the study counted the former. Presenting the figure as the risk of “suicide” quietly swaps one for the other.

It applied to daily, teen-onset users. The large effect was tied to young people who were using cannabis daily and who started as teenagers. It is not the risk carried by “marijuana use” in general, which is how the line is usually deployed.

It is an association, not proof of cause. The analysis found that heavy adolescent use and later suicide attempts occur together. It did not establish that the first causes the second, and the authors did not claim it did.

What the wider evidence actually shows

Across the broader literature the effect sizes are far smaller. Most studies land at odds ratios in the range of about 1.5 to 1.9. Daily or high-potency use pushes the association higher, to roughly 2.7 to 3.1 in some analyses. Those are real signals worth taking seriously, and they are also a long way from a universal “7-fold” risk.

The National Institute on Drug Abuse, whose research is frequently cited by ban advocates, has been explicit on the causation point: its own director noted that the agency cannot establish that cannabis use caused the increased suicidality observed in its data.

Why it matters

The single scariest statistic in the Texas campaign is also the most inflated. When an advocate strips a study of every qualifier and hands lawmakers a number seven times larger than the general finding, that is not evidence. It is a talking point, and it should be labeled as one.

Sources

• Silins E, et al. “Young adult sequelae of adolescent cannabis use: an integrative analysis.” Lancet Psychiatry, 2014.
• National Institute on Drug Abuse / JAMA Network Open, 2021 (association, not causation).
• Systematic reviews and meta-analyses, 2023 to 2026.