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If you smoke but go 2 weeks without nicotine exposure before testing, you may show urine cotinine levels of less than 50 ng/mL

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A resolution from a February 2003 ILO tripartite meeting on the future of employment in the tobacco sector, has encouraged all parties engaged in implementing the Worst Forms of Child Labor Convention and the Minimum Age Convention[293] to adopt concrete measures to eliminate child labour in the tobacco chain. The resolution called on the ILO director general to continue to promote the conventions and to assist in their application specifically in the tobacco sector.[294] These efforts should include providing governments with effective guidance regarding the hazards of tobacco work, and encouraging countries to review and update their hazardous work lists under the Worst Forms of Child Labor Convention accordingly

Cancer 16 , 431446 (2016)

Chlamydia is a sexually transmitted infection that may or may not give someone symptoms when they are infected