I weighed my 'usual grinder load' recently; it came out to about 1g.
At the beginning, one larger nug would last a day. Now I sometimes use the grinder 2x / day, but only occasionally. Most of my consumption is at 0.1g at a time (also measured). So, between 1-2g / day, total. This has been stable for the last few months.
For me, decreased effects lead me to decreased usage; it gets boring (!) loading up clean hardware for little effect. So I wind up doing a period of decreased (or even 'no') usage for a few days. Right as rain, afterward. All about being in tune with your body / mind, I suppose.
When I relayed my usage to my doc, after using weed for a year... he didn't even bat an eyelash. The improvements, as I relayed them, were readily apparent to him (I suffer from multiple treatment-resistant depression / anxiety). And losing another 20-ish pounds over the year also helps 'sell' the benefits (doctors are always after patients to lose excess weight).