10 things to know about legal pot

Tips for 4/20, an annual marijuana holiday

NEW YORK (CNNMoney) - Recreational marijuana -- the kind you smoke without a doctor's note -- wasn't legal anywhere in the United States five years ago.

Since then, voters in eight states and Washington, D.C., have given it the green light.

Sales of legal pot grew to $6.6 billion in 2016, according to New Frontier, a research company that analyzes the marijuana industry. That includes $4.7 billion for medical marijuana and $1.9 billion for recreational. The industry as a whole is projected to exceed $24 billion by 2025.

But there are rules for where you can buy pot and who can smoke it.

Here's what you need to know for 4/20, the annual pot holiday:

1. Anyone 21 or older can buy recreational marijuana in Colorado, Washington and Oregon. Pot shops for recreational marijuana have been open for business in Colorado and Washington since 2014, and in Oregon since 2015.

2. You can possess pot and get high legally in eight states and Washington, D.C., as long as you're 21. Recreational marijuana was legalized last year in Alaska, California, Maine, Massachusetts and Nevada. It was legalized in Washington, D.C., in 2015. But recreational dispensaries haven't been established in all those places yet, and state and local authorities are still working out rules for taxation and zoning. If you want to grow your own, check local laws first, because they vary from state to state.

3. Medical marijuana is legal in 29 states. According to the Marijuana Policy Project, a pro-legalization group, medical marijuana is legal in 29 states and Washington, D.C., Puerto Rico and Guam. West Virginia became the 29th on Wednesday, the day before 4/20, when the governor signed medical marijuana into law. In 18 other states, medical marijuana laws are so restrictive that the MPP considers them "ineffective or flawed."

4. You can still be fired for smoking marijuana. Even if you show up for work as sober as a judge, you can be fired for flunking a drug test in most states. This has happened to some medical patients.

5. The government owns and operates a pot store. The city of North Bonneville, Washington, opened the Cannabis Corner in 2015. It's the first municipally owned pot shop. Profits go to special city projects, like upgrading the local playground.

6. There's a black market for pot, even where it's legal. That's not just because old habits die hard. Illegal pot is cheaper because it's tax-free, while legal recreational pot is taxed heavily. There's a 28% tax in Colorado and a 37% tax In Washington. In Oregon, the tax ranges between 17% and 20%, depending on the city and county. Growers, processors, retailers and buyers all pay taxes. Medical marijuana tends to be cheaper than recreational because it is taxed at a lower rate.

7. Banking is a buzzkill for pot shops. Pot remains illegal in the eyes of the federal government, which classifies it the same as heroin. Banks are regulated by the feds, which means that most banks won't go near dispensaries, forcing many of them to deal in cash. In 2014, the Justice Department issued guidelines for banks on how to legally provide financial services to state-licensed marijuana businesses. But many banks remain wary of weed.

8. You can't take marijuana across state lines. Even when two legal states share a border, as Washington and Oregon do, carrying weed across state lines runs afoul of federal law. Don't bring it on a plane, and don't mail it.

9. You can't smoke and drive. Driving while stoned is illegal and dangerous, just like drunken driving. But there's no breathalyzer for weed, a conundrum for cops.

10. You can't smoke weed in public anywhere. Sorry, but those 420 pot parties in city parks are illegal, even in states where cannabis is legal.

--CNNMoney's Katie Lobosco contributed to this report.


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