E-cigarettes, contrary to popular belief, can be harmful to a persons health, according to the US Surgeon Generals Advisory on E-cigarette Use Among Youth
By using a specialized "Firm Filter" and ventilated paper, it dilutes the smoke slightly with air, resulting in lower relative tar and nicotine delivery and a much gentler throat hit
The Sleeping Car that I am in now has also been refurbished, but it just has flat panels in the hallways and does not have the oddly shaped panels of the other Sleeping Car
Its also been observed that vaping seems to encourage decay in areas where it usually doesnt occursuch as the bottom edges of front teeth
If you previously smoked fewer than 20 cigarettes per day and your current e-cig strength is anything higher than 3% nicotine, it is likely the cause of your irritated throat and coughing
I hope you find something that works for you very soon