My wife has Afib so I know a bit about it. If your grandmother is a smoker she will be far better off with vaping vs cigarettes. Not even going into all the health benefits of not having all the toxins in cigarette smoke especially the carbon monoxide which is now running about 17% thanks to the fire safety compliance "FSC" requirements in todays cigarettes. Before that law went into effect the carbon monoxide level was around the 3% level, but the lawmakers felt it was ok to treat millions of cigarette smokers as lab rats and place their health and well being in much greater jeopardy for the silly benefit of helping to prevent a few hundred house fires a year. Most of those house fire are caused by drunken idiots who fall asleep with lit cagarettes, but that was of no interest of the lawmakers because they really didnt and dont really care if smokers die at higher rates because of their damned "FSC" legislation. Millions of cig smokers are being made sick and/or dieing nowadays with lung and heart disease caused by the modern "FSC" cigarettes.
When I was still a cig smoker, within a couple months of the "FSC" cigs replacing all non fsc cigs available, it caused or exasperated a copd lung condition in myself, which forced me to roll my own cigs in order to avoid the dreaded "FSC" chemicals, as I was hopelessly addicted and could not stop smoking even though my lung condition wasn't getting any better. but, I digress...
Speaking of the Afib situation in your grandmother...
She would be getting away from the carbon monoxide which is one of the most detrimental issues of cigarettes. Carbon monoxide causes blood vessel cell death which gives a "tooth" or place for plaque to adhere to inside of the veins which leads to athrosclorosis(sp?) which can cause strokes and is, of course, a big concern in anyone having afib.
Nicotine is a vasoconstrictor, but in vaping would be far less than what she is exposing herself to when smoking cigarettes.
And if she were to switch to vaping instead of smoking, even without any intentions of ever quitting she would be a lot better off than continuing to smoke. However, if she is really serious about getting off the cigs altogether and/or really wants to satisfy her doctors suggestions, switching to vaping is the best gateway to breaking the habit forever since she will have full control of the nicotine intake and can taper it off in a much more controlled pace than trying to use other step down alternatives.
For most of us vapers, one of the best things about it is the ability to just get that few quick, satisfying and convenient hits without having to stink up the room or smoke an entire cigarette. Vaping gives us the satisfaction of the nic we want in a fast "smoke like" delivery method which takes care of that hand to mouth habit we long term smokers are so used to doing.
G ood luck helping your grandmother make the switch. Hopefully she can make the switch "cold turkey" straight to vaping like I did after over forty years of smoking. For me the best way was flat out quitting the cigs and not going back and forth between cigs and vaping which imho just gives that temptation to make the wrong choice instead of staying comitted to vaping INSTEAD of smoking.
HTH
