Of those nine states, five have ballot initiatives that could result in legal recreational use. Most significantly, California could legalize recreational use — thus making the entire West Coast a legal enclave for recreational cannabis.

All the initiatives below will be voted on this November, alongside the presidential election. Here's everything we know:

1. Massachusetts

In Massachusetts on November 8, voters will choose yes or no on Question 4 — a bill to legalize the recreational use, possession, cultivation, and sale of marijuana. The bill calls for regulation along the lines of alcohol, if passed.

Though Massachusetts is a long-running blue state, the legalization effort in the commonwealth faces serious opposition from sitting leadership in both parties. Republican Gov. Charlie Baker and Boston Democratic Mayor Marty Walsh oppose recreational legalization. The two joined Attorney General Maura Healey in a Boston Globe op-ed this March opposing the measure: