People vaccinated prior to infection of COVID-19 were less likely to report persistent change in smell, taste, hearing, confusion and more， which means they are less likely to get troubled by long COVID continuing symptoms. But vaccination's function on long COVID itself has still been controversive 

University of Illinois at Urbana-Champaign

33281 laboratory-confirmed COVID infections were followed-up via 6, 12 and 18-month questionnaires and linkage to hospitalization and death records to find out relationships between long COVID and possible factors such as age, gender, and previous health issues. Previous symptomatic infection was associated with persistent symptoms and poorer quality of life. Vaccination was associated with a reduced risk of seven symptoms.

Scotland Study on Long-COVID Possible Factors

Hastie, C.E., Lowe, D.J., McAuley, A. et al. Outcomes among confirmed cases and a matched comparison group in the Long-COVID in Scotland study. Nat Commun 13, 5663 (2022). https://doi.org/10.1038/s41467-022-33415-5

Outcomes among confirmed cases and a matched comparison group in the Long-COVID in Scotland study

1856(6%) among 31486 participants that had a symptomatic infection of COVID-19 reported had not recovered at all on their most recent follow-up questionnaire and 13350(42%) reported they had only partially recovered after being infected with SARS-CoV-2 for 6 to 18 months. 13 % reported improvement over time and 11%deterioration.  The most common persistent symptoms are fatigue, headache, muscle aches, and weakness.

Scotland Study Outcomes

The symptomatic infection was associated with a wide range of persistent symptoms, impaired daily activities and reduced health-related quality of life, independent of sociodemographic factors and pre-existing health conditions. Bad recovery outcome is associated with more severe infection, older age, female gender, black and South Asian ethnic groups, deprivation, pre-existing respiratory disease and multimorbidity. 

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