The illegal growers and sellers will still be in business, still trying to beat the system. They will be able to undercut the legal prices. In 2-3 years the BATF will become the Bureau of Marijuana, Alcohol, Tobacco, and Firearms. Look up the statistics on illegal tobacco sales in New York. High jacking truck loads of cigarettes and putting forged tax stamps on them is a major problem. No tax is paid on forged stamps. Lower prices than legal ones and higher profits.