No more than .5g a day for the last 2 years. And that includes vape, edible and smoke. I am a true lightweight (and usually grateful) and only enjoy a low level zone. 1 hit of anything (my stuff is high quality and high THC) typically medical and I am usually good....
I should add I consider myself a micro-doser also. I will do 5mg edibles until I reach my zone at maybe 10-15mg in a day. I can do more but I just don't enjoy going over my threshold. But I mostly use all day w. a larger amount around bed time. My tolerance never seems to change much.
Sometimes I wish I could take big 1970's jean jacket bad company hits:
https://youtu.be/U8FzGlgVGdo?t=57