I can get high off almost nothing. People never believe how little I want loaded in my bowl when I am in a group. Just one or two hits, and I am good with a group. The reason is exactly what the OP asked about. If I smoke too much I get quiet. My personality kind of shuts down. I have a very active imagination, and if I get TOO high in a group, my brain goes off into a strange direction, and I have trouble having a normal conversation, or any conversation at all.

So in a group I like a small hit or two, and I like to keep up with what is going on around me.

If I am alone and I have some boring thing to do, I like to have a hit or two, enough to get a little high but keep up with what I am doing.

If I am alone with nothing to do, I like to get totally blazed, 5 or 6 good hits, or maybe more. Or maybe a strong dose of green dragon. Then just let my brain go off wherever it wants to...