I am 2 years out of stage 3a breast ca.. b/l mastectomy, chemo , rad, aromatase inhibitors that are making me old, depressed, anxious, no temperature control, achy and extremely fatigued. a lot to handle. I recently started a little vaping w/ nicotine , feel terrible about it ( quit smoking at least 6 years ago ). I also have been a critical care nurse for many years and am not uneducated. Is there any evidence that vaping nicotine w/o adding smoke and its carcinogens to the lungs is hazardous to one s health as well as contributing to a recurrence of breast ca.