I can give some brief experience/memories from some of these combinations.
- Mushrooms + Cannabis: This was my first mushroom experience and the cannabis synergized very well with the entire experience. Quite safe, too. No negative effects were seen or felt. I may have had less anxiety about the experience but no-less I was flying. I woke up the next day with a slight headache. Whether that was from combination or just the mushrooms I do not know. It was quite mild, anyways.
- Kava + Cannabis: This I can agree to. However, withinin my experience, I've had very little success with combining this two. I did not feel any synergy from drinking 5 tbsp of kava + lecithin, and 1 bowl of cannabis. I slept incredibly well that evening but the effects of the cannabis seemed to take over the experience, instead. Although it was still profoundly relaxing, the head space did not change greatly. I'd like to give this another go with a group of friends.
Theobromine and caffeine are always great.
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Skip the manual, now, where's the master switch?
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