Answer: Two or three
Explanation:
If a person is suffering from substance use disorder,then he/she might be taking any medication or drug without any control which results in issue of brain functioning and behavior conduction. Substance than can be used in this case are nicotine, alcohol etc.
If a person is diagnosed of having mild substance use disorder then, he/she has two or three elements that match the symptoms or criteria of disease.
According to the question,Juan is at the mild stage of substance use disorder and thus , would be persisting two or three criteria matching the disease symptoms.