As the oil is in liquid form it can be consumed orally without smoking and can be easily administered to ailing children and adults for whom it is prescribed as medication. Though hemp plant is used for several industrial products and also as biofuel, the seeds and flowers of the plant are used to produce oil that is an active ingredient in several medical therapies for humans and animals.
Extracts of CBD—either from marijuana or hemp (a cannabis variant that is essentially free of THC)—are sold as an oil or in tinctures. You can also get CBD via a transdermal patch, capsule, sublingual spray, gel, cream, or vapor. Some contain pure CBD extract (or so they say); others—particularly if you’re in a state where recreational marijuana is not legal—will contain hemp extract, which includes CBD as part of its makeup. As of this reporting, recreational marijuana is legal in nine U.S. states and medical marijuana in 29. Don’t miss these 50 weird things that are banned in the United States.
Your statement about cannabis being illegal is misleading. Cannabis is the plant/herb itself. The difference in what is legal vs illegal to all states is the flower of the herb containing THC. Anything < 0.3% is regarded as HEMP as the constituents lack enough of the THC compound to create the psychoactive effect. MARIJUANA is known for the psychoactive effects. They are both forms of CANNABIS.
Zuardi, A. W., Crippa, J. A., Hallak, J. E., Bhattacharyya, S., Atakan, Z., Martin-Santos, R., … & Guimarães, F. S. (2012). A critical review of the antipsychotic effects of cannabidiol: 30 years of a translational investigation [Abstract]. Current Pharmaceutical Design, 18(32), 5,131–5,140. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/22716160