The effects of edibles may not be felt for up to and beyond 90 minutes. Peak effects may be delayed up to 2 hours, whereas the peak effects of smoking or vaporizing come in as little as 5-10 minutes. This is because of the way our bodies process THC, the psychoactive ingredient in cannabis.
When smoked, delta-9 THC bypasses processing by the liver and directly enters our bloodstream via the lungs. When eaten, cannabis is metabolized by the liver, changing delta-9 THC into 11-hydroxy-THC. This results in a slower onset with more intense effects. The effects of the digested 11-hydroxy-THC are often described as being more psychedelic.