Khulna unit of Bangladesh Tamak Birodhi Jote, an antitobacco body, formed a human chain in the city yesterday on the occasion of National Tobacco-Free Day. Eight different professional, socio-cultural and nongovernment organisations joined the human chain programme. Later, the leaders of the Jote submitted a memorandum to the prime minister through the deputy commissioner of Khulna at 11:30 am demanding amendment to the existing tobacco control act and its strict enforcement. Md Masum Billah, general secretary of the Khulna unit of tobacco control act implementation committee handed over the memorandum to the deputy commissioner.