The 0.3%
Everyone also has a unique endocannabinoid system which makes everyone’s experience with the cannabinoids very different. Some people may find that they are extra sensitive to THC, or that it stays in their system for a longer time than others.
The body processes cannabinoids through metabolism, and metabolic rates vary widely among individuals. Even people of a similar age group and gender will process cannabis differently based on lifestyle choices, such as diet and exercise.