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Controlling for lifetime history of mental illness and childhood adversities caused the largest attenuation of the ADHD-SUD relationship. More than one-quarter (27%) of those with ADHD had a history of depression, which was much higher than the prevalence among those without ADHD (11%).
‘Alcohol use disorder is most common among adults aged 20-39 with ADHD, followed by cannabis use disorder and other drug use disorders. More than one quarter of those with ADHD had major depression.’
“These results emphasize the importance of addressing depression and anxiety when providing care to those with co-occurring ADHD and SUD,” reported lead author Esme Fuller-Thomson, Professor at University of Toronto’s Factor-Inwentash Faculty of Social Work and Director of the Institute for Life Course and Aging. “Individuals with untreated depression and anxiety may self-medicate to manage the symptoms of an untreated psychiatric disorder, which can result in greater substance use.”
Those with ADHD also experienced high levels of adverse childhood experiences, with more than a third of young adults (35%) reporting that they had been physically abused and one in nine reporting that they were a victim of sexual abuse (11%) before the age of 16.
A strong association between childhood adversities and substance use disorder has been found in previous research as well.
“Childhood maltreatment may disrupt emotional regulation and the neuro-development of children, which may predispose them to later developing substance dependence” says co-author Danielle Lewis, a graduate of the University of Toronto’s Masters of Social Work (MSW) Program.
Alcohol use disorders were the most common substance abuse disorders among young adults with ADHD (36%), followed by cannabis use disorders (23%). Young adults with ADHD were also three times more likely to experience an illicit drug disorder (other than cannabis) when compared to their peers without ADHD (18% vs 5%).
“One potential explanation for the extremely high rate of illicit drug use among those with ADHD is the accelerated gateway hypothesis,” said co-author Senyo Agbeyaka, a recent University of Toronto MSW graduate who is a social worker at University Health Network. “This theory posits that people with ADHD tend to initiate substance use at a younger age, resulting in riskier use and greater problem severity in adulthood.”
The data were drawn from the Canadian Community Health Survey Mental Health, a nationally representative sample of 270 and aged 20-39 with ADHD 6,602 without ADHD.
The findings of our study underline the extreme vulnerability of young adults with ADHD. “There is a clear need to develop prevention and treatment programs to address substance use issues among those with ADHD, while also promoting mental health and addressing childhood adversities,” said Fuller-Thomson
Source: Eurekalert
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