A new study estimates that millions more Americans are using nicotine vapes and cannabis in states that have legalized recreational marijuana, worrying experts who warn that the drug is stronger and more dangerous than in the past. Here’s what you need to know about the marijuana legalization usage study:

The JAMA study findings

Research shows significant increases in substance use:

The dispensary effect

Usage accelerated after retail operations opened:

The population impact

Harvard researcher calculates millions affected:

The health concerns

Expert cites marijuana potency and accessibility:

The legalization stalemate

Policy momentum has slowed significantly:

The state revenue pressures

Officials raising taxes to address budget gaps:

The veteran health study

JAMA research links legalization to opioid problems:

The current legal landscape

Most Americans live in states with some form of legal marijuana:

The potency warnings

Experts emphasize dramatically stronger marijuana:

The addiction pathway concerns

Anti-marijuana advocate sees linked substance use:

The advocate response

Marijuana supporter calls for education over panic:

Read more:

• Millions more using marijuana, nicotine vapes after legalization, study finds

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