I am not familiar at all with Swellenger Syndrome and cannot find that condition after a thorough search.
There is a Zellwegar Syndrome that is a genetic disorder that is defect is 13 genes that develops during pregnancy. Since the metabolic and neurological abnormalities that cause the symptoms of Zellweger syndrome are caused during fetal development, treatments to correct these abnormalities after birth are limited. Most treatments are symptomatic and supportive.
The prognosis for infants with Zellweger syndrome is poor. Most infants do not survive past the first 6 months, and usually succumb to respiratory distress, gastrointestinal bleeding, or liver failure. I do not think that cannabis would be helpful for this syndrome.
Perry Solomon, MD