Gresham-Barlow School District spokeswoman Athena Vadnais says one student started to get sick after eating the cookies Thursday morning and told Dexter McCarty Middle School officials about them.
Administrators brought in a school nurse. Eventually, four of the seven students complained of feeling ill. Vadnais says two parents took their children to a hospital to be checked out.
The spokeswoman says all the students are OK.
She says all the students involved knew the cookies contained marijuana and will be disciplined according to school policy.
Gresham police are investigating.