This research data entails a questionnaire for the collection of exposome information in the different EXIMIOUS cohorts. It interrogates basic demographic and anthropometric information, education, habits regarding smoking, diet, alcohol, and exercise, hobbies and activities, household product use, pets, metal implants, tattoos, sleeping difficulties, and post-COVID hygiene. The questionnaire is in English but is also available in other languages (Dutch, Danish, Spanish, and Romanian) upon request. (2025)