I took Ventolin expired by 8 months - I understand that the drug may have less effectiveness, but can it be dangerous to health in a different way after such a time?

It is difficult to assess unequivocally. The manufacturer declares the expiry date of the medicinal product as the time until which the substance remains chemically stable and pharmacologically active. Usually, a properly stored medicine retains its value a little longer, but there are no exact guidelines on how long it can be used or what chemical changes can occur in the meantime. Therefore, I am not able to give a simple answer whether there are already any harmful decay products of the active substance in the expired packaging or not. On our website you can check the prices and availability of the medicines you are looking for: https://www.gdziepolek.pl/produkty/82077/ventolin-aerozol/apteki