Oral ingestion is unpopular due to inefficiency and the likelihood of stomach upset. People who are self-administering ketamine are most likely insufflating. I

Oral ingestion is unpopular due to inefficiency and the likelihood of stomach upset. People who are self-administering ketamine are most likely insufflating. I have friends who have reported very positive results with intramuscular injection, but most people don't have access to hygienic injection apparatus, nor any experience using it safely, so insufflation is most common.