Transcript for Lines forming all across California at newly legal marijuana dispensaries
Next, to the green rush in the golden state. California opening 2018 with its first legal recreational marijuana sale. But not everyone is celebrating the new cash crop. ABC news senior national correspondent Matt Gutman reports from southern California. Reporter: Tonight, in California, they're lining up to light up. We've been looking forward to this day for a long time, haven't we? Reporter: Marijuana today became legal to buy and possess for anyone 21 and over. Lines forming outside dispensaries from Oakland to Diego. Reporter: We were here at about 5:00 this morning. It's history. Reporter: And business is set to boom in what's expected to be a $7 billion industry in the state. And tonight, dispensaries are bracing for the rush. We're getting ready, we have five new registers circumstances new bud tenders. Reporter: These stores offer cookies, candy, and even dog treats. But easy access makes the California highway patrol uneasy. You can look at the states that have legalized it and they've seen an uptick in collisions and fatal collisions. So it's definitely a concern for us. Reporter: Tom, with legality come taxes. The California pot industry is expected to generate over a billion dollars in taxes. Now, some of that is already earmarked towards marijuana res research, education and drug treatment programs.
This transcript has been automatically generated and may not be 100% accurate.