how dangerous is tobacco can be bad for your health even if you are not the one smoking. Breathing in the smoke can lead to many health problems. Vaping also bad for you. E-cigarettes FDA Tobacco Education & Prevention

If we would make forbidden all that science has deemed potentially destructive, well are lives would be a lot less interesting(or more depending on how one sees it) This may not answer all your points, but bear in mind that smoking is inherently dangerous, whereas some of the things you mention (e.g

Wait another 24 hours to see if bleeding improves

10 Appearances Pediatrician

The cartridges have the coil at the top of a central stem, and theres a gauge on the outside so you can easily see how much juice you have left

The complainants said the smoke rose to their apartment and came in through their air vents even when they closed their doors and windows and used a fan and air purifier

Then you need to decide which e-liquid to use