THC Delta 9 + a-pinene

"Delta-9-tetrahydrocannabinol (Delta-9-THC) is the primary psychoactive ingredient [in marijuana]; depending on the particular plant, either THC or cannabidiol is the most abundant cannabinoid in marijuana. ... 

[T]he effects of THC are included among the effects of marijuana, but not all the effects of marijuana are necessarily due to THC. ... Cannabinoids are produced in epidermal glands on the leaves (especially the upper ones), stems, and the bracts that support the flowers of the marijuana plant. Although the flower itself has no epidermal glands, it has the highest cannabinoid content anywhere on the plant, probably because of the accumulation of resin secreted by the supporting bracteole (the small leaf-like part below the flower). ... 

Delta-9-THC and Delta-8-THC are the only compounds in the marijuana plant that produce all the psychoactive effects of marijuana. Because Delta-9-THC is much more abundant than Delta-8-THC, the psychoactivity of marijuana has been attributed largely to the effects of Delta-9-THC. ... 

All recent studies have indicated that the behavioral effects of THC are receptor mediated. Neurons in the brain are activated when a compound binds to its receptor, which is a protein typically located on the cell surface. Thus, THC will exert its effects only after binding to its receptor. ... Binding to a receptor triggers an event or a series of events in the cell that results in a change in the cell's activity, its gene regulation, or the signals that it sends to neighboring cells."

Pinene (C10H16) is a bicyclic monoterpene chemical compound.[1] There are two structural isomers of pinene found in nature: α-pinene and β-pinene. As the name suggests, both forms are important constituents of pine resin; they are also found in the resins of many other conifers, as well as in non-coniferous plants such as camphorweed (Heterotheca)[3] and big sagebrush (Artemisia tridentata). Both isomers are used by many insects in their chemical communication system. The two isomers of pinene constitute the major component of turpentine.

α-Pinene is one of the principle monoterpenes, and is important physiologically in both plants and animals, and to our environment. α-Pinene tends to react with other chemicals, forming a variety of other terpenes (like D-Limonene) and other compounds. α-Pinene has been used for centuries as a bronchodilator in the treatment of asthma; ever notice how your lungs seem to open up when hiking through a pine forest in the warm summer? α-Pinene is also anti-inflammatory. It’s found in conifer trees, orange peels among others, and known for it’s sharp sweet odor. α-Pinene is a major constituent in turpentine.