When you smoke or vape cannabis you may feel the effects quickly, but it can take between 30 minutes and two hours to feel the effects of edibles like cookies, sodas, and ice cream. Edibles may have higher concentrations of tetrahydrocannabinol (THC, the active ingredient in cannabis). It is important to know about the delayed effects of edibles because if you eat too much too fast, you are at a higher risk of poisoning.