That still hugely misses the point, because sentences are not equal. Violent offenders serve on average 4.7 years while drug offenders serve under 2 years.
~40% of people who are sent to state prison are sent with drugs as the most serious charge.
And I'm assuming they mean incarcerated (jail+prison) and not just 'jail'. Most of the people in jail are awaiting trial, people in prison have been convicted.
The article linked in the comment you're replying to seems to include both jail and prison. The comment itself didn't mention either and just said "incarcerated".
It is only ~15%
https://www.prisonpolicy.org/reports/pie2020.html