We don't have a mature culture around cannabis usage. Alcohol has this benefit, and we have some social norms on how to enjoy it. A big one is the "don't drink before 5" adage. Norms like this for weed will develop in time, I'm sure.
I smoke about 6 to 12 times per year, mostly THC/CBD (Dutch weed), sometimes CBD only (specifically, weed from Switzerland).
Dutch weed: 3 to 5 puffs and I'm fine. Smoking half a joint or more is definitely overdosing it, feeling cold and uncontrollable tremors can occur.
Swiss weed: I smoke half a joint.