The Russian man, identified by police as 24-year-old Artem Lotts, was arrested during a raid on a house off Chao Fa Rd in Moo 1, Wichit, on Wednesday night (Mar 26).
Joining the raid were officers from the Phuket Public Health Office (PPHO).
Lotts was found in possession of over 1 kilogramme of dried cannabis buds, various cannabis extracts, e-cigarettes and more than 200 smoking devices, said an official report of the arrest.
Officials estimated the total value of the seized items to be close to B1mn, the report added.
Lotts was taken into custody and faces multiple charges, including selling or processing controlled herbs for trade without permission under the Protection and Promotion of Traditional Thai Medicine Wisdom Act B.E. 2542, possessing Category 5 narcotics without authorisation, and selling e-cigarettes that were illegally imported.
He is also charged with working in Thailand without a valid work permit.
Wichit Police Chief Somsak Thongkliang stated that the crackdown was part of an ongoing effort to combat illegal sales of cannabis and e-cigarettes in accordance with national policies.
Police have been intensifying investigations into illicit drug and vape sales in Phuket and are determined to apprehend all violators, he said.
Meanwhile, Lotts remains in police custody as further legal proceedings are carried out, he noted.