Pittaya Jinawat, director of the northern narcotics control office, said he also believes millions of pills are poised for transport into Thailand.
"We are quite afraid that the situation of the smuggling might return to normal levels. One of the signs is that the price of the drugs has become close to the same price prior to the war on drugs," he said.
Thaksin plans to declare Thailand drugs-free on Dec. 2, to mark the birthday of revered King Bhumibol Adulyadej a few days later.
But Pittaya said the victory would really be about a reduction in the level of drug addiction in the kingdom.
"It means we can narrow down the extent of the problem. For instance if you consider the number of people or villages that have the problem, it's about 80 percent of the villages in Thailand -- more than 80,000 villages," he said.
"But we have set a target to narrow down this number to 40 [percent] or 50 percent," he said.
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