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Understanding reliability and validity in qualitative research

A number of scholars have invoked the precautionary principle to call for action in the face of uncertainty on a range of public health and environmental protection issues.[92] The precautionary principle has been set out in the Rio Declaration on Environment and Development as: Where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures. [93] By this principle, gaps in scientific evidence on the harms of certain aspects of childrens work in tobacco farming should not be used as a reason to delay taking cost-effective preventive action to protect children from the plausible threats to their health posed by work in the crop

Speaking exclusively with Express.co.uk, GP and medical director of Cosmedics skin clinics - Doctor Ross Perry - shared more about the phenomenon of quitting smoking and mouth ulcers

doi:10.1136/jech.51.2.208