Final answer:
PTSD increases the vulnerability to cannabis use disorder, especially in individuals seeking self-medication or coping mechanisms.
Explanation:
Among the individuals listed, the army veteran with PTSD is most vulnerable to the development of a cannabis use disorder. PTSD has been linked to a higher risk of substance abuse, including cannabis use disorder. Individuals with PTSD may turn to substances like cannabis to self-medicate their symptoms, cope with trauma, or alleviate psychological distress.
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