if you aren't using chemical nutes they'll be fine
and as much as I respect Wet, I have to disagree w/ this statement:
"Conditions for growing mj are different than what worms require."
I put some redworms and castings (w/ cocoons) in my pots at the beginning of last cycle...I harvested about two weeks ago, and when I went digging around in my pots (to make holes for fresh transplants) I found a ton of redworms inside the rootball. I mustve found 10-20 adult worms per pot (#5-#10 smartpots), and a bunch of younger worms. the larger pots had even more! I actually have to be pretty careful while digging or I'll mutilate a bunch of worms...
starting a wormbin is a great idea too...but you can definitely add some worms into your pots if you want. but a 2'' topdress of fresh vermicompost is going to be much better for your plants than placing a dozen redworms in the pot..so you should get started on the worm bin ASAP. Also, proper castings will contain lots of cocoons...which will hatch in the right conditions (hopefully the conditions of your soil) and therefore you will end up with worms in your pot even if you don't physically place them in there. bagged castings won't do this for you. either way, proper soil will contain all sorts of organisms ranging from the smallest bacteria and protozoa up to things like centipedes, springtails, and even large ol' creatures like redworms. IMO conditions for redworms are very similar to conditions for MJ..with the exception that worms enjoy fresh foodstock and ganja likes the food to be composted first.
to put it in perspective...i have a few 30gallon smartpots in my flower room w/ ROLS soil. I also use a 30gallon smartpot for vermicomposting. The smartpot I use for vermicomposting is filled with roughly 1/3 ROLS, 1/3 manure, and 1/3 malibu compost (bu's blend)..plus a bit of pumice for aeration. I could probably throw some veggie seeds in my worm bin and have them grow...as long as I placed my fresh food scraps on the other side of the pot. the worms love it...and the conditions aren't very far from the conditions in my no-till pots indoors. the worms in my no-tills probably don't reproduce as much as the ones in my worm bin..but they're still playing their part in the soil ecosystem and improving things.
here is a plant in a #10 smartpot that probably has two dozen worms in it
also the worms can be a great measure of soil moisture...when it gets too dry they start to crawl out of the pots. a good visual indication that the soil is too dry!!! lol. if worms think it's too dry, the microbes will think its too dry, and also probably the plant...these are all bad news. keep the worms happy, you'll keep the microbes happy, and your plant will be happy. worms also hate anaerobic conditions, so they will crawl out if you are overwatering
friendly little helpers...