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Basic Trope: A mundane product is sold as a valuable (and usually illegal) one.
Straight: Bob sells "marijuana" that is actually just bits and pieces of oregano.
Exaggerated: Bob sells wood shavings as marijuana.
Downplayed: Bob sells actual marijuana, but claims it's "stickier" (that is, more potent) than it actually is.
Bob is an undercover cop in a sting operation.
Bob is a con artist, looking to make some quick money.
Inverted: Bob sells marijuana, but tells people it's only oregano.
Subverted: Bob sells actual marijuana.
Double Subverted: He claims the pot to be a new "super-sticky" variety, when it's just a more mundane "average potency" type.
Parodied: When the would-be stoners find out that Bob sold them oregano, they literally stone him.
Zig Zagged: Sometimes Bob vends actual marijuana, sometimes oregano (typically when his normal supply is running short.)
Averted: Bob does not sell anything, legal or otherwise.
Enforced: The writers want a quick way to show off Bob's Con Artist nature while giving him victims that people will feel less sympathy for because they believe Drugs Are Bad.
Lampshaded: "Hey...this isn't pot! This is just oregano!"
Invoked: Bob, The Aggressive Drug Dealer, is running short on supply, but very high on demand. He doesn't want to tell his customers "no," so he puts oregano into bags and sells it as pot.
Defied: Bob knows this will anger customers. Angry customers mean lost business, and lost business means no money. (Not to mention, in this industry, angering the wrong people can put Bob's life and safety (and/or that of his family) at risk.) So he doesn't try to pass off oregano as marijuana.