As far as beer goes, it's probably much more interesting to use cannabis for flavor and aroma than for THC content. It's easy enough to add a little tincture to anything for THC, including a couple of drops into a beer after you open it. But keep in mind that you you would be doubly dosing with every drink -- both with alcohol and with THC. Could get weird, especially if the beer already has a relatively high alcohol content. But modern microbrews and homebrewers tend to brew for flavor, and there are a lot of possibilities yet to be explored. However, last I checked, home-brewing forums tended to be highly resistant to anyone even mentioning using cannabis in brewing.