From 1995 to 2003, the most recent year for which we have statistics, sentenced drug offenders accounted for 49% of the growth in the number of inmates in federal prisons. In 2003, 55% of all federal prison inmates (87,000 of 158,000) were sentenced for drug offenses.
Wilkes, Donald E. Jr., "Pot Pope Imprisoned" (2006). Popular Media. Paper 157.