Does Pot Use Hamper Thinking in MS?
Study: Multiple Sclerosis Patients Who Smoke Marijuana May Have Slower Reaction Times
WebMD News Archive
Feb. 13, 2008 -- New research shows that among multiple sclerosis patients, those
who smoke marijuana may have slower
reaction times on mental skills tests and are more likely to report a history
of psychiatric diagnoses.
That news, published in today's advance online edition of Neurology,
comes from a Canadian study.
The researchers studied 140 multiple sclerosis patients, including 10 who
said they smoke marijuana at least once a month.
The patients took various mental skills tests and were interviewed about
their mental health history.
Marijuana smokers had slower average reaction times on a test that
challenged them to process information quickly. And they were more likely to
report a history of psychiatric diagnoses, most of which were depression or anxiety diagnoses.
It's not clear if marijuana use caused those conditions. The study doesn't
show which came first -- marijuana use or problems with emotions and thinking.
It's also not clear if the patients, who all attended the same outpatient
clinic, are representative of all MS users.
But in a news release, researcher Anthony Feinstein, MPhil, PhD, FRCP,
states that "this is important information because a significant
minority of people with MS smokes marijuana as a treatment for the
Feinstein conducted the study with Omar Ghaffar, MD, FRCP. Both work in the
psychiatry department at the Sunnybrook Health Sciences Centre in Toronto.