April 7th marks National Beer Day, an unofficial holiday celebrated on this date because it was the day in 1933 when the Cullen-Harrison Act, an act permitting Americans to drink beer up to 3.2% alcohol by weight, took effect.

Despite concerns about the negative effects of combining alcohol and cannabis, home-brewers of beer have been making THC infused beverages for a long time. It makes sense that the flavors of cannabis would be complimentary to beer, since many people believe the cannabis plant and the beer flavoring agent hops have common ancestry based on their similar look, smell, and taste.

However, buying a THC-infused commercial beer seems unlikely anytime soon, even in the legal state of Colorado with its hundreds of craft brewers. Various federal and state regulations prohibit the sale of alcoholic beer containing enough cannabis that it would lead to a high.

There are also limitations on naming commercially available beer after illegal drugs, which has led to name changes and some wink-wink, nudge-nudge naming, such as Dark Horse Brewing Co's "Smells Like Weed" beer being renamed "Smells Like A Safety Meeting."

However, there are plenty of cannabis-themed beers and brews containing elements of cannabis that are available in bottles, cans, and draught form. Here are some of the most popular:

1. Lagunitas Censored Rich Copper Ale. (AKA The Kronik)

2. Oskar Blues Pinner Throwback IPA

3. Dark Horse Brewing Co. Smells Like A Safety Meeting India Pale Ale

4. Kettle House Bongwater Hemp Ale

5. Redhook Brewery: Joint Effort

6. Humboldt Brewing Company Hemp Ale

7. Dude's Brews Dank IPA

8. Mancave Brewing Company Hippie Joe

9. Nelson Brewing Company Harvest Moon Hemp Ale

10. Millenium Buzz Hemp Beer

11. Lagunitas Undercover Investigation Shutdown (You'll want to read the story behind the name on this one, trust us.)

DId we miss any? Tweet them at us.

h/t Thrillist, Merry Jane, Mashable.