1. A majority of the public favors legalization
Polls have consistently shown that half to a majority of the public wants marijuana to be legal. 

2. Clinical data suggests it can help improve patient quality of life                                  cases shown that marijuana halted a 14-year trend of an increasing number of opioid-related deaths in the United State. The study suggests that cannabis may be an alternative to pain-fighting opioids, and a much safer one at that.

 3. It's a potentially new source of revenue and jobs
Legalizing marijuana could also be a boom for the economy, the new developing cannabis industry will create a hundred thousand or more jobs by the year 2020. That's more jobs that will have been  created by the manufacturing sector, utility sector, or even government sector & will open up new tax revenue for the country.