sentences:  The report states cannabis is the top cash crop in 12 states, is one of the top three cash crops in 30 states, and is one of the top five cash crops in 39 states.Gettman estimated the value of U.S. cannabis production at $35.8 billion, which is more than the combined value of corn and wheat.Furthermore, the report states according to federal estimates, eradication efforts have failed to prevent the spread of cannabis production, as cannabis production has increased tenfold in the past 25 years.