Tolerance is a concept describing a subjects reduced reaction to a drug following repeated/prolonged use. It is commonly known that THC found in cannabis produces tolerance. When someone ingests THC it tightly binds to your CB1 receptors and overtime this will decrease the amount of available receptors therefore decreasing the effect of the drug.
Recent studies have shown that CBD actually has the opposite effect as THC and produces what is called reverse tolerance. This occurs because CBD increases the bodies natural production of endocannabinoids. Due to this reverse tolerance effect its actually probable you will need to lower your dose as time goes on. There are a few reasons why some people believe that have developed a tolerance when in-fact that is not the case. Changing the CBD product you use often may cause lowered results due to variance in potency or added ingredients. It is also possible to achieve CBD saturation which simply means your body is holding as much CBD as it physically can, if this occurs you simply need to take a day or 2 off and then everything will be back to normal.