Did I damage myself from smoking for 45 minutes?

I smoked 2 years ago about half a pack and they were really strong. Today, I smoked a cigar and cigarette in 45 minutes. I tried not to inhale and just held it in my mouth and blew out. I'm still in the process of recovering (my lung capacity is coming back and my nose and stuff). Now, I'm afraid I juts reversed the healing process and I'm really scared. I want my regular lung capacity and breathing to come back. Did I just cause serious damage to my lungs and nose and stuff? Is there anything I can do to accelerate the healing process? I am only 17 by the way. I am relaly scared right now. I know I did something stupid but I won't do it again. asdlkjfhajkldfshjkadhjkslfaklsjdfasdfasd…