Once it is legal:

1. The police can work on other crimes and have less time in court prosecuting cannabis
2. free up the courts for more timely prosecution of serious crimes
3. lessen the prison population that is already over crowded
4. lower costs for courts, prison's, police, surveillance (over flights ... etc ) therefore lowing tax's or enabling tax's to be used in other needy areas like infrastructure, police, school's, fire .. etc
6. home growing is already a big grey market and would become much larger ( much bigger then home brew beer ) where seed and grow suppliers would be many and a very competitive market.
7. commercial growers ( old tobacco companies ) would naturally jump in and this would also cascade down to the tobacco farmers who have been looking for alternative crops.
8. "paraphernalia" would become mainstream again ( remember the 70's? anyone??) again growing another small business market for both manufactures and sellers

I could go on and on :bigsmoke: ... lol