Again, pouch size (actual content) and product strength determine how many mg of nicotine are in a portion
The authors argue plausibly that this is at least partly due to the rise of filtered cigarettes from the 1950s (although rates of adenocarcinoma have been rising among non-smokers too)
Millhoff & Co Ltd 'Aircraft' cigarette cards, early 1930s, fifty four cards, with rare blue back 'worm's-eye view', display mounted, with glazed front and rear in two frames
Additionally, since there were few never-smoking adults who used ECs, the ability to detect significant associations with respiratory symptoms may have been limited, calling for future research to seek out larger samples of adults who use ECs but never-smoked cigarettes
Cigarettes might have the instant hit and portability, while chewing tobacco offers longer-lasting effects and a buffet of flavors