What is the origin of word doobie?

The word "doobie" is believed to have originated in the early 20th century in the United States. It is thought to be derived from the Spanish word "dobla", which means "to fold". This is likely because doobie is a slang term for a marijuana cigarette that has been rolled by hand and is typically folded over at one end. Additionally, the word "doobie" is sometimes used to refer to a marijuana cigarette that has been laced with other drugs, such as hashish or opium. In this context, the word "doobie" may be derived from the Spanish word "doblar", which means "to adulterate".