What is the typical dose of meth?

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SWIM was born and raised in Minnesota, which had a thriving rave scene in the early-90s. Meth was very prevalent in the scene, and SWIM and his friends would usually each get a half when they went to parties. They would pour the entire half out into a sinlge rail, and snort the entire thing at once. None of them ever died or anything, but they would get high as hell and stay that way for hours and hours.

SWIM is now into his 30s and has only done meth one time since. He and his brother split a hald, and just did little bumps. The high was suffient and it lasted them a long time. SWIM could never imagine railing an entire half at one anymore. and can't beleive he sirvived those days.

Is this a typical does, or were those kids insane?