One of the most popular and well-known uses of pure cannabis essential oil is to get relief from stress and anxiety, according to a report published in the Journal of Cannabis Therapeutics. The natural compounds found in this oil, including the famed THC, which is what gives cannabis the distinction of a drug in many countries, are very good for releasing pleasure hormones and relaxing the mind. It also helps in reducing stress and inducing a sense of calmness and relaxation. 
CBD oil and cannabis oil are both known to reduce the symptoms and side effects of cancer. The presence of both THC and CBD helps in relieving the pain associated with cancer. According to research done by Hansen M., Medical University of Vienna, Vienna, Austria, it also provides relief from the side effects of chemotherapy including nausea, vomiting, and anxiety.  
CBD Oil Benefits
Topically applying some cannabis essential oil for headaches or at the temples or the spot of intensity for migraine can be an effective way to get relief. Many people turn to prescriptions for cannabis and cannabis essential oil due to its potent defense against crippling headaches and pain. 
A survey led by the McGill University Health Centre in Canada revealed that cannabis use results in an improvement in non-cancer p ain, sleep, and mood patterns. In the same survey, it also revealed that ‘high’ and dry mouth were the most commonly reported side effects. People who suffer from cancer also turn to cannabis-related options, including therapeutic grade CBD oil, when the pain of chemotherapy or the disease itself becomes unbearable. 
In a statement released in June of 2018 by FDA, it states, “the FDA approved a purified form of the drug cannabidiol (CBD). The new product was approved to treat seizures associated with two rare, severe forms of epilepsy in patients two years of age and older”. 
CBD oil is an extract of Cannabis indica or Cannabis sativa—the same plants that, when dried, make marijuana. CBD oil is believed by some to treat pain, reduce anxiety, and stimulate appetite in the same way that marijuana does, but without its psychoactive effects. CBD has also shown promise in treating certain types of seizures.
To avoid interactions, tell your doctor and pharmacist about all prescription, over-the-counter, herbal, or recreational drugs you are taking.
This cannabis extract may help treat nerve pain, anxiety, and epilepsy
Human studies evaluating the use of CBD in treating chronic pain are lacking. Those that do exist almost invariably include THC, making it difficult to isolate CBD’s distinct effects.
Cathy Wong is a nutritionist and wellness expert. Her work is regularly featured in media such as First For Women, Woman's World, and Natural Health.
To determine an exact dose of CBD, remember that each drop of oil equals 0.05 mL of fluid. This means that a 30-mL bottle of CBD oil will have roughly 600 drops. If the concentration of the tincture is 1,500 mg/mL, one drop would contain 2.5 mg of CBD (1,500 mg ÷ 600 drops = 2.5 mg).
Unlike CBD or hemp essential oils, you will test positive on a drug test if you use THC/marijuana or cannabis oil.
By helping to balance the endocannabinoid system in the body, CBD oil also helps to boost the amount of healthy bacteria in the gut, thus promoting better overall health. It also appears to boost metabolism and healthy digestion and improve the health of the gut-brain barrier.
Here is an additional article at WebMD about Marijuana, Hemp, CBD.
What about cannabis oil/marijuana/THC?
Like all essential oils, hemp essential oil can naturally support many of the body’s systems and provide a wealth of health benefits. Here are some of the main benefits.
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Hemp essential oil (Cannabis sativa) is extracted from the upper leaves and flowers of the hemp plant.
Cannabis oil is the unprocessed extract from the entire marijuana plant. It contains a combination of CBD and THC.