Can a 32 yr old already have emphysema from smoking since 15?

Yes. Many variables at play here, including "pack years of use, " underlying conditions, family, medical and environmental history. See your doctor for a check up and strategization to stop smoking.
Yes. Depending on the genetic susceptibility, COPD can be present by age 32. It usually takes longer to manifest in the average person however.
Yes.... Depending on how many packs a day are smoked, that is indeed enough time to develop emphysema, a form of copd, or even malignancy. Smoking cessation is crucial to decrease the progression of disease as well as symptoms. An evaluation by a doctor for diagnosis and treatment is also needed.