Marijuana was a slang term coined by Mexican immigrants during the early 20th century. Mr. Anslinger (First US drug czar) utilized this terminology in order to distract the public from actually understanding what they were outlawing at the time.

Mary Jane is actually "María Juana".. It's not the same: Marijuana and María Juana..

Marijuana is actually a derogative term of the plant meant to make fun of the Mexican community that smoked the plant in Texas.