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The hardening hypothesis proposes that as the prevalence of smoking in a population declines, a greater proportion of the remaining smokers will have less motivation to quit, be more dependent on smoking, will make fewer quit attempts and will be less likely to quit

Gravity, Einstein said, reflected the curvature of space and time in the presence of matter

Yellowed paper: Over time, exposure to light or humidity can discolour the paper

And they focused on a type of nerve cell, called POMC cells, known to be involved in eating behavior

Meanwhile, China has implemented a ban on online sales of e-cigarettes

In situations where workers breathe in low levels of CO, effects may take time to appearalthough cellular damage may already be in motion