Today is every stoner's favorite holiday – 420!

To make today extra sweet, Zen Cannabis has made a giant 420-pound chocolate bar to honor the festivities.

This monstrosity, now known as "Big Zen," is 9 feet by 4 feet and three inches thick, it took four months to get the plans just right, and it contains a whopping 4.2 million milligrams of THC.

And this chocolate bar can be yours for $42,000!

CEO Jeremy Zachary told HuffPost:

This is for serious buyers only. And start with small bites.

The Big Zen was made in the company's Oklahoma City offices, and it's estimated that 100 pounds of cannabis flower were used.

I'm getting paranoid just thinking about it!

We wanted to do something that hasn't been done before, and Oklahoma's the only state we could do it because it's the only one with no limit on milligrams.

We needed a custom mold, and that took a month to make," he said, adding that the company also needed a custom table to hold the finished product and a custom cooling chamber.

SCOTT VO FOR ZENCANNABIS.COM

This bad boy took "four pours to get the whole bare right" and 24 hours to make it – plus another 18 hours for cooling.

Zen Cannabis believes they created the world's largest cannabis chocolate bar, and oh buddy, I hope they're right!

We probably don't need to go any bigger.