"In 2010, there were approximately 12.1 million diabetes-related ED visits for adults aged 18 years or older"
https://www.hcup-us.ahrq.gov/reports/statbriefs/sb167.jsp
Should we outlaws sugar and high fructose corn syrup ?
Anyway, looking at the full statistics on drug abuse emergency rooms visits it doesn't look like total [hypothetically successful] prohibition of marijuana would have any effect as OTC, other drugs and alcohol would obviously fill the void:
http://www.drugabuse.gov/publications/drugfacts/drug-related...
"Highlights from the 2009 Drug Abuse Warning Network
In 2009, there were nearly 4.6 million drug-related ED visits nationwide. These visits included reports of drug abuse, adverse reactions to drugs, or other drug-related consequences. Almost 50 percent were attributed to adverse reactions to pharmaceuticals taken as prescribed, and 45 percent involved drug abuse. DAWN estimates that of the 2.1 million drug abuse visits—
27.1 percent involved nonmedical use of pharmaceuticals (i.e., prescription or OTC medications, dietary supplements)
21.2 percent involved illicit drugs
14.3 percent involved alcohol, in combination with other drugs