Incidence and risk factors of postoperative pneumonia following cancer surgery in adult patients with selected solid cancer: results of "cancer POP" study
It dates back, with stops and starts, to at least the Ancient Romans and examples of nielloware have been found in various metals (brass, bronze, copper, silver, gold etc) for thousands of years
They have had a presence since the early 2000s but until recent years, the brand has mostly been found in Eastern Europe, Scandinavia, Russia, and Saudi Arabia
Some countries have banned vapes altogether, like Brazil, Thailand, and India
Several factors, such as smoking frequency, ventilation quality, and wall paint types, each play a role in the degree of discoloration that might occur