My recollection is that one doesn't normally smoke three joints a day. I understand that current varieties are much more potent.
It would be more useful to compare the effects on the typical smoker of one, versus the other.
That is correct. A person with glaucoma would smoke approximately 8-10 joints per day.
Not enough information in this survey. One joint can be potent enough for 1-6 people depending on the size and potency. Way too much wiggle room for an accurate result.