Ethanol is the substance that, if consumed in excess, can cause
intoxication.
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Drug intoxication ("intoxication confusional state") is
responsible for up to 20% of delirium cases, either from side
effects, overdose, or deliberate ingestion of a mind-altering
substance.
Substance induced disorders are those symptoms/medical conditions that can be directly attributed to the use of a substance. For instance the presentation of condition occurs during intoxication/withdrawal. The symptoms have not occurred before use and they do not persist after use.
Substance use disorders include substance abuse and substance dependence. You use the drugs/substance to deal with the symptoms that preceded substance use but then become dependent or abusive of that substance.