Since it takes approximately five half-lives to completely eliminate a drug from the human body, CBD is likely to remain in the system for about 85 hours, or about 3 or 5 days, says Dr. THC is usually only detectable in plasma for about five hours after taking it. However, the metabolites of THC and, therefore, CBD may be present for up to one week. In both cases, after a single administration, CBD is usually not detected in the blood or urine after one or two days.
Smoking CBD has a half-life of 31 hours and prolonged oral use of CBD increases the half-life to 2-5 days. It usually takes 5.5 half-lives for a drug to be completely eliminated from the system. Therefore, CBD taken orally would completely leave the body in about 11 to 28 days, but it may be impossible to detect it in a blood test much earlier. The half-life of vaporized or smoked CBD in blood plasma is much shorter than that of CBD ingested within a few hours.
It may take longer for a regular user to completely remove CBD from their system than an occasional or new user. The highest bioavailability (how much is absorbed and enters the bloodstream) comes from CBD that is vaporized or smoked, and CBD oil tinctures applied sublingually (under the tongue) come in second place. Research showing how long CBD can be detected in urine is rare, but one study showed that a single test subject kept CBD detectable in their urine for only 24 hours. It's also worth noting that since CBD products aren't regulated by the FDA, you may be taking CBD mixed with other cannabinoids, which could increase detectability.
If you smoke dried flower CBD or use a vaping cartridge, the CBD enters the bloodstream in a matter of seconds. If you smoke CBD or use a CBD e-liquid in an e-cigarette, it is a direct path to the bloodstream and therefore offers a maximum and immediate effect. It's a common misconception that CBD and THC are the same thing; while CBD is a natural supplement, the metabolites of THC may be detected during drug testing. As the article explains, the use of isolated CBD and broad-spectrum CBD is highly unlikely to result in a positive result for THC.
The duration of CBD's effects depends on several factors, including the user's metabolism and whether they use CBD regularly. (CBD oil), the amount of CBD that produces an active effect is only about 19%, mainly because it must pass through the digestive tract before entering circulation. The effects of CBD usually wear off within a few hours, but that depends on the amount of CBD taken, the method used, and the user's size, metabolism, and usage history.