About 3.7 million Thais reported having used narcotic substances other than alcohol drinks and cigarettes, with 2.9 million saying they have taken the drug in the past year, according to Abac poll.

The poll sounding out public opinion about the missing pseudoephidrine-laced medicine said Thursday.

Of those who had taken the drugs, one million were in the northeast followed by the central region at about 700,000 persons, the North at some 500,000 persons, the South at about 300,000 persons and Bangkok Metropolis at more than 200,000 persons.

Read more: The Nation