Ok guys listen up.
I did this about erm....6 months ago? My buddy was crushed in a construction accident, i.e. steel falling on him, and now his back spasms and he has constant pain so here in Oregon he got a license for Marijuana and uses it frequently. He also found interest in making marijuana beer and since i am a homebrewer he came to be for the services.
Mixing marijuana and alcohol is a trick because you need to know your ratios. THC on the molecular level will connect with the alcohol molecules and if you have too much THC and not enough alcohol there will be nothing for the THC to attach to and therefore it's a waste of bud. He wanted to use an ounce and a half for this brew, and with the high quality of his plant i had to do some research on how much alcohol we would need to get proper assimilation.
I ended up doing a Belgian trippel at 8.8% ABV to level it out. I brewed it up and waited a week and half for the primary fermentation to end, transfered to secondary and this is where i added the Marijuana. Like mixing marijuana and vodka, it needs alcohol present to mix, hence, after primary fermentation. THC is delicate and will most likely be broken and useless in a boil, so it's not recommended.
Essentially i dry-budded my beer for two weeks and bottled. It is also true that the THC will eventually die out inside of the beer after a couple of weeks so we ended up having to consume them all within a month of bottling.
The end product was very interesting, try imagining a sweet belgian trippel with the aroma of hops and bud and slight off-flavor created by the weed. I only drank 2 because they were his and i don't really care for marijuana all that much although i am from Oregon.
The feeling though was actually quite cool. I felt drunk, but really really happy and relaxed after the second one. I mellowed out quite a bit and didn't really feel spinning like you would if you got drunk and smoked, instead these two affects complemented each other quite well.
Was it worth it? Well, if you really really like marijuana and have the means, go ahead. But as for a worth while investment or just an experiment, i wouldn't recommend it. It definitely went down in my brew diary as something pretty badass but as for actual likeness to the end product, i was give-or-take.
So that's my .02 guys, take it or leave it.
Cheers