
In fact, oregano is often sold on the street by drug dealers who claim that it's marijuana because, when dried and chopped, oregano does look like marijuana. You won't know that you've been conned until you light up. The dealer will be long gone by then. This is a regular occurrence on the street; you don't get what you paid for. The side effects of smoking oregano are the same as those for smoking anything: Coughing, shortness of breath, lung damage and sore throat.