Inhalant intoxication= slurred speech, disturbed gait, drowsiness
Inhalant withdrawal= headaches and irritability
usually will present with rash around nose and mouth too
FA2020 pg 570
I think inhalants are a new add to FA2020 (at least they weren't in Zanki), so I go to this one by elimination:
eliminated Meth + PCP + Cocaine because they're Stimulants.
eliminated EtOH b/c it would take a long time for cerebellar atrophy to manifest and I doubt a 14yo has been drinking since birth.