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Those given guarana performed no better than those given placebo.58 Another study found that guarana actually had negative effects on a variety of learning tasks.59 The same is true for yerba mat, another herbal source of caffeine

Adaptable for Various Products: Can be scaled for cigarettes, cigars, vapes, and other tobacco products

This detailed map allows orthodontists to design a tailored treatment plan that outlines the gradual movement of your teeth over time

doi: 10.3389/fpubh.2025.1667261 Received 16 July 2025 Accepted 03 September 2025 Published 23 September 2025 Volume 13 - 2025 Edited by Aida Meto, University of Modena and Reggio Emilia, Italy Reviewed by Ashek Elahi Noor, Atlantic Technological University, Ireland Waseem Jerjes, Imperial College London, United Kingdom Gaye Keser, Marmara University, Trkiye Updates Copyright 2025 Carneiro, Zhang, Zhao, Ojcius, Daly and Almeida-da-Silva

Shuang Xi () literally means Double Happiness

Most dual and e-cigarette users in this study exploit loopholes in the current tobacco law and the largely unregulated e-cigarette environment in South Africa