How much marijuana does a smoker smoke?

I don't believe there is such thing as "too much" marijuana... however, due to the variance in amounts of THC in each "bud" of marijuana it is impossible to determine how much is "too much". Any amount that causes severe neurological changes in perception or physical changes in coordination can be considered "too much".

Marijuana should, as with any other drug, be taken moderately until the "patient" determines the effect each "batch" has on them. It is a matter of personal determination.