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Patients filled out questionnaires about their smoking habits, diet and other personal information

Carbon monoxide is a second major threat

But the inclusion of the warning notice in all advertising almost clinched things, for the companies, while admitting nothing, could now claim more strongly than before that they had made no effort to conceal the alleged risks connected with the use of their products

This growth is supported by subscription models, direct-to-consumer pricing, and the adoption of age-verification technologies that comply with regulatory standards

The study fills a major evidence gap regarding additional disease risks conferred by menthol flavouring in cigarettes, the researchers say