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Mexico was the first country in the Americas to sign and ratify the World Health Organization's (WHO) Framework Convention on Tobacco Control (FCTC) in 2004. More than a decade later, it is appropriate to evaluate legislative and regulatory progress and the associated challenges; and also, to propose a roadmap to prioritize the problems to be addressed to achieve long-term sustainable solutions. Mexico has made substantial progress in tobacco control. However, regulations have been only weakly enforced. The tobacco industry continues to interfere with full implementation of the WHO-FCTC. As a result, tobacco consumption remains stable at about 17.6%, with a trend upwards among vulnerable groups: adolescents, women and low-income groups. The growing popularity of new tobacco products (electronic cigarettes or e-cigs) among young Mexicans is an increasing challenge. Our review reveals the need to implement all provisions of the WHO-FCTC in its full extent, and that laws and regulations will not be effective in decreasing the tobacco epidemic unless they are strictly enforced., Competing Interests: Declaration of conflict of interests. The authors declare that they have no conflict of interests.

Recently Mexico passed federal and state-level laws banning smoking in indoor spaces. These actions are totally in accordance with measures proposed in the WHO-FCTCs article 8, ratified by Mexico in 2004. This essay reviews scientific evidence that secondhand smoke causes both chronic and acute diseases among non smokers, children and adults. There is no safe level of exposure to secondhand smoke, so the only effective intervention to protect Mexican people from such harmful exposure is by promoting 100% smoke free indoor air, as the two new laws do. Total banning of smoking is associated with reduction in smoking prevalence, amount of cigarette smoked per day, and an increase in cessation rates. Reductions in acute respiratory symptoms and hospitalization of acute myocardial infarction have been also reported. Well documented examples show that main tobacco industry arguments against smoke free policy: negative economic impact and lack of support from the public, are unjustified. These two laws strengthen the Mexican tobacco control program. Next steps include their implementation, evaluation, enforcement of compliance and encouragement for similar laws at state level.

Objective: In Mexico no evaluation of environmental tobacco smoke exposure in homes or habitants has been conducted. The objective of this study is to quantify environmental nicotine in Mexico City homes, simultaneously evaluating nicotine levels in children and women., Material and Methods: In July 2005 a convenience sample of 41 homes was selected, 20% without smokers, 80% with smokers. Nicotine passive monitors were allocated in homes for one week, obtaining samples of hair from inhabitant non-smoking women and children. Samples were taken to the Johns Hopkins University where nicotine was extracted and analyzed using gas chromatography. A survey of opinions and behaviors related to environmental tobacco smoke was conducted., Results: Environmental nicotine concentrations had a median of 0.08 microg/m3 (IQR 0.01-0.64), in children's hair 0.05 ng/mg (IQR 0.05-0.29), and in women's hair 0.05 ng/mg (IQR 0.05-0.19). Environmental nicotine concentrations and in children's hair were highly correlated (rS=0.49), and increased with the number of smokers at home. The majority of adults surveyed showed support towards measures of environmental tobacco smoke control., Conclusions: Homes are important spaces of exposure to environmental tobacco smoke. Particularly high levels of exposure were observed in children's hair, attributable to the presence of environmental nicotine at home. Integral preventive activities to eliminate active smoking and to avoid tobacco consumption at home are required.