Since legalization, use has gone up for adults. It has not gone up for children, so those numbers have stayed the same. Much as in the initiative a certain percentage of tax revenue was given to the Department of Health for education, another percentage was given to a sister agency for treatment, so they have been using the dollars they receive to provide treatment.
We do know that for children, marijuana is the number one cause of a child entering substance-abuse treatment. The number of adults entering treatment for marijuana has declined since legalization.