Since your dentist will be able to tell regardless that you are a smoker, it is best to just be upfront with the dentist about your smoking habit
They ask for your driver's license to verify your age then hand it back to you
Vaping, which is the term used for the smoking of e-cigs is fast finding an increasing number of takers, for this reason, these days
In theory yes, but in practice HK and many other places have heavily-subsidised public healthcare and extensive welfare systems, so the cost of such behaviour is distributed to everyone, including non-smokers
Photographs of all packs with opened filters, showing the crushable capsules if present, are provided in online supplemental figures S1.aS24.a for the kreteks and in online supplemental figures S25.a-S33.a for the cigarettes