How long does it take for your body to go back to normal after quit smoking?

Ok I quit around December.I want to know how long it takes for your body to go back to normal after you quit smoking? Because sometimes I get shortness of breath
I started smoking at 15 I’m 22 now but when I smoke it wasn’t everyday it was off & on n I would quit for a while.

If I quit smoking now, will the damage on my lungs improve or is it permanent?

I’ve been smoking cigarettes for approx. 1 year+ now, & I have roughly 5 cigarettes a day. I want to quit smoking because I just tried to run a mile & found it incredibley difficult >_< If I quit smoking now, will the damage on my lungs improve or is it permanent?

How do I get my mom to quit smoking after bowel obstruction surgery?

Had emergency surgery. Will be coming home soon. She has been smoking since she was a teen & she is coming to my place so I can watch after her. How can I get her no to smoke? she has emphazema too. Please help. It’s been a horrible scarry week. Don’t need anymore scares. 6 kids total & we all want her to quit. Thanks