How much do people use?
First, it depends on the quality of the Cannabis. If you have great Cannabis - you don't need much to get the desired result.
Second, it depends on if it is School Day or the Weekend.
Third, it depends on if you wife or GF is on your ass because you've been smoking too much. LOL!!
But for a reasonable, casual, Cannabis user, 1-3 grams a week is about right.
Some will smoke more, some will smoke less.