I had a colonoscopy and endoscopy this morning. its been 5 hours. can i smoke marijuana?

If you are a regular uses I don't see that these procedures would have any effect on you activities of life. You may not be aware that regular users have a four fold increase in the development of schizophrenia in their lifetime. Whether this allows it to emerge or triggers it in some has not been defined. Thus I can't recommend its use for anyone.

Smoking in general and smoking marijuana in particular is not recommended from a medical standpoint due to detrimental effects on health, with the exception of few medical conditions when it may help with symptoms, medical grade and non inhaled.