In 2010, CNBC reported that the marijuana business in America grossed about $40 billion annually. Legalization, the report said, could expand that business into a $100 billion industry, with some economists predicting higher numbers, depending on how governments levy taxes on the sale and distribution of plant. Medicine, hemp industry. human rights, saves trees bc hemp can produced paper and using the oil from cannabis is a cleaner alternative to fossil fuels. Get educated please!