Actually, the body DOES create its own form of THC. Not "cannabis", though, because cannabis is the plant itself. ;)
This chemical is called Anandamide (AEA).
"...its structure was first described by Czech analytical chemist Lumír Ondřej Hanuš and American molecular pharmacologist William Anthony Devane in the Laboratory of Raphael Mechoulam, at the Hebrew University in Jerusalem, Israel in 1992."
-Wikipedia
The amount of anandamides we receive naturally is far below the amount that comes from consuming cannabis, however scientists have found no damage to the CB1 and CB2 receptors as a result of cannabis use.
Anandamide is thought to be an endogenous ligand for vanilloid receptors, which controls pain and inflammation.
Furthermore, because anandamide has been found to be involved in working memory, scientists are studying its roles in human behavior: eating, sleeping and pain relief.
No
I think THC is only produced by cannabis plants. The human body cannot naturally produce THC. it is commonly found in the cannabis plant.
Propofol is not a naturally occurring substance in the human body.
how long will it stay in my body
no
Yes.
The human body is naturally radioactive. The potassium found in the bodies of humans is the main cause of the radioactivity.
no
the skin
The effects of cannabis are caused by cannabinoids, most notably tetrahydrocannabinol (THC). Cannabis has both psychological and physiological effects on the human body. It can be detected by urine, blood,hair and saliva drug tests.
Lanolin is secreted by glands in the skin of animals that have wool, like sheep. People have body hair, and not wool, so lanolin will not be found naturally in the human body.
Cortisol is the same thing that your adrenal glands produce naturally in the amount of 7-10mg daily.