I'm 36 and had a 5mm sessile adenoma removed from my cecum. How often should I get a colonoscopy now and is this adenoma of high risk for cancer?

5 years. It is some thing you should discuss with your GI doctor. In general getting a repeat colonoscopy in 5 years is safe. You may consult this site for more information on this topic: http://www.cancer.org/cancer/colonandrectumcancer/moreinformation/colonandrectumcancerearlydetection/colorectal-cancer-early-detection-acs-recommendations.