By Ryan Randazzo, Farah Eltohamy | Arizona Republic
Since 2012, 11 states have legalized marijuana use for adults as Arizona voters are considering on their ballots this year. Researchers are just beginning to understand the effects of those laws.
Colorado and Washington were the first states to legalize the drug, and California, the most populous state in the nation, followed them.
Among the most pointed concerns with legalization — and key arguments against the campaign in Arizona — are whether it has caused more young people to use the drug and whether more people are dying in auto crashes caused by impaired drivers.