For productivity, coffee and a spliff. 50/50 cannabis/tobacco with a coffee can help with focus and creativity, and productivity too. Probably good to have some chopped veggies/nuts/etc as a snack too.
Edit: The 50/50 ratio is adjustable of course for newcomers to have less tobacco or more (as Europeans might do it).
Interesting results! I hope they get to spend more time studying the cannabis side, too. Careful coffee/cannabis combos are one of my favorite ways to dig in, hyperfocus, and be productive.
A coffee and a joint is a wonderful way to while away an afternoon.