Some people are more obsessive about it than others.
How to make an 8th Generation Joint.
"To make a first Generation joint, you and/or friends of yours smoke five joints down to roach size (If you are not familiar with the term 'roach', you probably shouldn't be here but it means the very last nub of the joint that is basicly too small to smoke without a 'roach clip'). unroll the leftovers from your five roaches into one new joint. You have now created one 1st Generation Joint. From here the process continues into the next Generations in the same manner. To make a second Generation Joint takes five first Generation Joints smoked down to roaches again and then unrolled into the new 2nd Generation Joint..."
1st Gen = 5 joints
2nd Gen = 25 joints
3rd Gen = 125 joints
4th Gen = 625 joints
5th Gen = 3125 joints
6th Gen = 15625 joints
7th Gen = 78125 joints
8th Gen = 390625 joints
and so on...