The rally started at the college and proceeded to the Angamaly bus stand.
The Kochi city police commissioner made the shocking revelation while addressing the Kerala Police Officers' Association state conference in Ernakulam.
Narcotics Cell Assistant Commissioner Prakashan Padannayil will head the investigation team.
An Excise Department survey report says that 79% of the youth get drugs through friends and 5% of them get the drugs from members of the family. Also, 38.16% of them had given narcotic substances to friends.
In September, Keralites were shocked when 652 drug cases were registered within four days.
The accused had 203gm MDMA with him when arrested by the Malappuram police.
A recent drug bust yielded clinching evidence on a large number of school-goers who were regular clients. A schoolgirl who underwent counselling revealed how students were baited and pushed into drug trafficking.
Khalid (52), a fisherman, and his brother-in-law Shameer (40) were hacked to death in the attack.
Edith Schlaffer, founder of Women Without Borders, at a seminar recently said that parents' use of drugs, including alcohol and smoking, will have a major impact on children.
It requires a great deal of patience and wisdom on the part of guardians or teachers to persuade youngsters to abstain from any sort of addiction.