From some research I did on my homework tonight:
“[U]p to 40% of patients seeking treatment for substance dependence report a history of suicide attempt(s)” (Yuodelis-Flores, 2015).
References:
Yuodelis‐Flores, C., & Ries, R. K. (2015). Addiction and suicide: a review. The American Journal on Addictions, 24(2), 98-104.