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Going away to college is a major stressor that may push some over the edge and causes biochemical changes. Because of all of these factors, parents or even helicopter parents should not be blamed as causing depression, etc. There is usually a genetic predisposition for many of these mental illnesses.
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“Causing” is a strong term.
However, as you note, going away to college is a major stressor. If someone were predisposed, and had developed many life-skills and orgn skills while growing up, it could be argued that they might be less likely to be “pushed over the edge” once they went away to college.