Oh, in addition to smaller hits, another option is just to hold them for less time. Just inhale, then exhale, instead of holding them in for a while. Also, take more time in between hits to gauge the effects better.
It may or may not be a good option for you, but in Europe (and some other places) they mix the weed with tobacco for just this reason.
Unless you're a medical user and WANT the CBD, I don't think that's a good answer here, but CBD/THC ratios control the quality of the "high"/medical effect, and high CBD strains give limited psychoactivity.
In general, its not hard to find low potency strains, if that's really what you're after. ANY strain could be low potency if you just harvest it early enough. You can also leave in more leaf when you do the trim to lower potency, or just smoke the "larf" buds near the bottom.
IMO, that's not really a good answer here, either. If you're going to the time, effort, and trouble of growing, you want the best buds possible in the end. If you want less effect, just use less, that's all.