How many lines in an eight ball of cocaine?

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An eight ball of cocaine contains 3.5 grams. Based on purity, the line size could change, but in general first timers or occasional users can get anywhere from 10 all the way up to 20 lines out of one gram. Tolerances build very quickly and many people step up to as few as 3-8 lines per gram after extended use. (which is where cocaine becomes a very expensive habit)

Thus: Routine users - avg 5*3.5 = 17.5 Occasional users - avg 15*3.5 = 52.5

Allow me to point out that after a few days of doing 233mg lines (3.5g or 3500mg / 15) most people will likely be stepping up to larger lines at a logarithmic rate. (very fast, and gradually slower once one is consuming huge lines.) This causes the above number to decrease over time. Also don't forget to consider purity as it can have a profound effect on the amount of lines done.