When you quit smoking do the affects go away?

I’m 20 years old, I’ve been smoking for about 7 months now, about a pack a day, I recently quit and I was wondering does the build up of tar or anything else resolve? I’m a vocalist in a band and I’ve noticed it’s been a lot harder to hit my high notes, and I also get short of breath doing it. Does anyone know if that kind of stuff goes away?

Any help would be appreciated, thank you.