Great advice from all the others, so I'll attempt to approach from the other angle of how desperate you are to help your mother. I assume that because my own mother died in 2004 of COPD and she smoked until the last day of her life, when she was not responsive to anything but a very little bit. That little bit was when Dad lifted her from the Jazzy to her chair in the living room and kissed her goodbye before he hesitantly left for work, on his birthday no less- sigh. She briefly opened her eyes and lifted her lips to him with a tiny bit of pucker to kiss him back. He and I were caring for her at their home, as per her wishes, but we were helpless to 'save' her or to take away an adult person's cigarettes. A couple of hrs later, her eyes suddenly opened and she looked sort of through me. I held her hand and spoke lovingly as she calmly died.
The point is not that the analogs killed her but that she chose her own path after the diagnosis of COPD 6 yrs before. I, too, have COPD and I chose a different path, not more noble or heroic, but far better, imo, for me. One son has followed me into vaping and one is seriously considering it. It was still their choice, and only theirs, because they are adults. There is no moral or ethical push from me regarding this because it comes down to what we want and how much we want it- either by smoking or by shifting to vaping or by any other attempt to control the addiction, both physical and emotional. You do not need guilt, from yourself especially, nor from others to help you because that is more likely to sabotage you instead.
Relax! Love her and yourself, and accept vaping as a new interesting, tasty and even fun tool rather than an assignment, if you can shift yourself to that perspective. If you can lay down the desperation and the guilt of slipping or not moving fast enough, I think and hope the analogs will shortly follow. I do not know you, so only used what I felt to springboard into trying to help in some tiny way. If my post was way out of line, I apologize.
Good luck! You've already began and that is great. BIG props for a great beginning!!