Oeople caught smoking in areas where the ban applies will face fines of between 20,000 riel (about $5) and 50,000 riel (about $12.50).
At least 16 other opposition members and supporters have been jailed since the two parties in late 2014 agreed to work together in parliament under a so-called culture of dialogue.
After the CPP-dominated parliament approved the motion, Son Chhay, chief opposition whip, said the vote was a violation of the constitution.
The comments came as the CNRP announced it was ready to organize mass protests in response to the attempted arrest of its deputy leader, Kem Sokha.
In 2012, Cambodia was criticized for failing to issue a joint statement related to the South China Sea dispute when Phnom Penh hosted the Asean Summit.
General Khieu Sopheak, spokesman for the Ministry of Interior, ruled out the possibility of issuing an amnesty for Rainsy while Hun Sen remained prime minister.
Police set up a roadblock Monday about 500 meters from the headquarters of the opposition Cambodia National Rescue Party.
ចំណាប់អារម្មណ៍របស់អ្នកទេសចរខ្មែរចំពោះសារមន្ទីរសព្វទស្សន៍អង្គរ ឬ Angkor Panorama Museum ដែលជាស្នាដៃវិចិត្រករកូរ៉េខាងជើងនោះ គឺក្ដីរំភើបចំពោះបច្ចេកវិជ្ជាគំនូរ 3D។
The Bank announced on May 19 it would issue $130 million in new loans to Cambodia to fund poverty reduction projects.
The two countries announced they would work to implement the Paris Agreement, an international agreement signed by 177 countries in April.
The request from the Ministry of Agriculture came a day after the Royal Ploughing Ceremony, which symbolically marks the start of farmers’ cultivation period.
Hello VOA radio listeners said they had a hard time understanding the difference between what constitutes an individual’s right to free expression and defamation.