Suicidal thoughts and behaviors (STB; ideation, planning, attempt) are strongly related to substance use behaviors, including cannabis involvement (Byrne et al., 2004; Calabria et al., 2010; Johns, 2001; Moore et al., 2007; Pompili et al., 2012), especially early (Byrne et al., 2004; Lynskey et al., 2004) and heavy cannabis use or cannabis use disorders (CUD) (Fergusson et al., 2002; Johns, 2001; Lynskey et al., 2004; Pedersen, 2008; Pompili et al., 2012; Van Ours et al., 2013). For instance, Silins and colleagues (2014) recently reported that suicide attempts were substantially increased (adjusted odds-ratio > 6) in young daily cannabis users.
