Before starting to learn how long marijuana stays in human body, it is better to get some information about what marijuana or weed really is.
Marijuana name actually comes from Mexican workers who used the Mexican term “Marijuana” for drugs, probably derived from the Spanish form of the name “Maria Johanna”.
The real name of marijuana is hemp. Cannabis is the Latin and scientific name for hemp, a crop grown in the USA since the 17th century, among others. People have been using cannabis for more than 10,000 years. As food, as a raw material, as medicine and as a drug.
Marijuana is a green or gray mixture of dried, finely chopped flowers and leaves of the hemp plant (Cannabis sativa). The essential active chemical substance in marijuana is THC (delta-9-tetrahydrocannabinol), which also appears in other forms of cannabis.