If you just HAVE to get high then Morning Glory seeds are relatively dangerous compared to other legal highs. You can smoke chamomile (yes, the tea) or wild lettuce (like ancient Roman soldiers) without risking liver failure or heart attack. Even nutmeg is less dangerous and erowid.com has some nightmare stories about that.
Morning Glory seeds were sometimes used in combination with other herbs for poison based abortions before modern medicine. I don’t recall if it directly poisoned the fetus or caused abdominal cramps to help move it along.