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Teens who used marijuana had more gray matter, a mass of cells that affects how humans mature over time.

Teens’ brains could be altered after using marijuana just one time, study finds

A new study in the Journal of Neuroscience found that smoking a joint just once or twice can alter that teenage brain by increasing gray matter.
A roadside test for drug levels has yet be created.

Over half of Michigan’s medical marijuana users admit to driving while high. Here’s why that’s just as dangerous as drunk driving.

Data from University of Michigan found 51% of Michigan's medical marijuana users drive while high despite the drug's ability to impair coordination.

The maker of Corona beer is plunging after slashing guidance because of its marijuana acquisition

Constellation Brands, the company behind Corona beer, plunged 11.45% early Wednesday after giving weak guidance due to its cannabis acquisition.

Check out our exclusive list of the top lawyers working on the biggest deals in the booming marijuana industry that’s set to skyrocket to $194 b...

Check out Business Insider's exclusive list of the top lawyers working on the biggest deals in the booming marijuana industry.
Marijuana use is becoming less stigmatized.

States where medical marijuana is legal

Medical marijuana is legal in 33 states and Washington DC. Here's what you need to know about how medical marijuana laws vary across the US.

This map shows every US state where pot is legal

Marijuana is legal for adults over the age of 21 in 10 states; medical marijuana is legal in 33.
Marijuana's effects on the brain can slow down a person's reaction time, worsen their coordination, and throw off their balance.

The number of people testing positive for marijuana in workplace drug tests is exploding, particularly in public safety and national security roles

New data found more people are testing positive for marijuana in drug tests, with marijuana use increasing 4% in the workforce year over year.
Read Business Insider's exclusive list of the top VC firms in the cannabis industry.

Check out our exclusive list of the top 12 venture capital firms making deals in the booming marijuana industry

Check out Business Insider's exclusive list of the top venture capitalists in the cannabis industry. These firms are signing the most deals — and they're showing no signs of slowing down.

On the heels of hemp legalization, regulators have fired a ‘warning shot’ to the $1 billion CBD industry

This month, Trump legalized hemp, a plant that's nearly identical to marijuana. Now, US regulators are deciding how they'll manage the CBD industry.
Marijuana use is becoming less stigmatized.

10 things that can happen after a state legalizes marijuana

Cannabis is recreationally legal in 10 states and Washington, DC, decreasing stigma. Here's what tends to happen after states legalize marijuana.