THC (aka tetrahydrocannabinol) is the main psychoactive ingredient in cannabis. THC may make you feel calm, introspective (thoughtful), euphoric and giggly. Other effects can include feeling paranoid, anxious, hungry and withdrawn (not wanting to socialise or talk). The duration of effects are different depending on the way it has been consumed. Generally, if you are vaping THC products, you will feel the full effects after a few minutes. These effects are likely to wear off after around one hour and after–effects may be felt for a few hours.