31 Arsenic, beryllium, cadmium and polonium-210 are IARC group 1 carcinogens, meaning there is sufficient evidence that they are carcinogenic to humans
As Chinas exclusive importer and exporter, China Tobacco has very strong power over pricing. China had 306 million smokers in 2018 and cigarette sales reached 1.44 trillion yuan (US$210 billion), accounting for 45 per cent of the global market, according to market-research firm Frost & Sullivan
E-cigarettes remain popular among younger people while nicotine pouches that are placed between the lip and gum are now showing signs of growing in popularity, with the CDC reporting a substantial increase in nationwide sales in the US since 2016
The second group included patients who smoked only tobacco
The critical factor here is to weigh the potential benefits and risks of vaping versus smoking, considering that most vapers are either current or former smokers