My persistent cough went away within 1 week upon the switch to vaping. I still have a bit of phlegm cough left over, especially when I vape the heavier 26mg nic e-juices for several hours on end without much daily exercise.
The phlegm cough is a 1 time throat clearing type, not a multiple deep hack like the persistent cough was. Even this cough is less frequent with each passing day.
I also still have a touch of asthma induced by smoking and have to use an inhaler a few times a day. This could be alleviated/reduced if I just exercised more, as I didn't need it much when I smoked AND exercised. I DO have to keep it handy on my nightstand, though since I wake up frequently to cough or change sides. I've got sleep apnea as well.
I'm happy that the lungs start to clean up after only a week or two and after smoking for nearly 40 years. I remember some years ago seeing some lungs at a museum comparing those that smoked and those that didn't. The smoking lungs looked like a 10 hour smoked brisket, while the non smoking lungs looked like well, brand new. I was told that when you quit smoking, your lungs start to go back to their original pink color within a month.
If we'd only had these little saviors back in the day, think of all the lives saved. It's mind boggling.