Dear Participant, The objective of the study is to determine the level of exposure to furan and methylfurans through coffee and tobacco consumption. The survey will consist of answering a 10 to 15 min questionnaire related to your coffee and tobacco consumption habits. This study is being carried out by the Universities of Liege and Ghent. By taking part in this study, you acknowledge that you have read and understood the information on the study below. Please ensure you have read and understood this information before continuing. Participation is open to persons aged 18 or older, residing in Belgium, and belonging to the University of Liege or Ghent as staff or student. It is entirely voluntary and anonymous. The data will be collected and analysed by the Unit of Research in Epidemiology and Risk Analysis. Your data might be shared, but they will be completely anonymous, and it will not be possible to identify you individually from your answers. If you are concerned about this study or about the manner your data are processed, or if you wish to contact us about your rights, please first contact Prof. Claude Saegerman at the following address: claude.saegerman@uliege.be
Code	Question (EN)	Attributes
Sociodemographic characteristics
G1	In which university are you working or studying?	-Liege -Ghent
G2	What is your gender?	Male/Female/Other
G3	How old are you?	-18 to 24 years -25–39 years -40–54 years -55 years or more
G4	Are you:	-A student -An administrative staff -A technical staff -A scientific and/or academic staff -Other (if so please specify)
Coffee consumption
C1	How frequently do you drink coffee?	-Never -Occasionally -Daily
C2	If ‘daily’: How many cups of coffee do you drink everyday:
C2a	At home?
C2b	At the office?
Brand loyalty
B1	Do you consume usually a particular type of coffee product (e.g., beans, grounded, instantaneous)
B1a	At home?	Yes/No/I don’t know
B1b	At the office?	Yes/No/I don’t know
	(If yes to B1a), Which type of coffee product do you consume at home (the most frequently)?	-Coffee beans -Ground Coffee -Coffee substitute -Instant -Liquid -Other (if so please define) -I don’t know
	(If yes to B1b), Which type of coffee product do you consume at the office (the most frequently)?
B2	Do you usually consume a particular brand of coffee?
B2a	At home?	Yes/No/I don’t know
B2b	At the office?	Yes/No/I don’t know
	(If yes to B2a), What brand of coffee do you consume usually at home?	Exhaustive list to provide as a drop-down menu + ‘I do not know’ and ‘Other’
	(If yes to B2b), What brand of coffee do you consume usually at the office?
B3	To what extent are you committed to your regular brand of coffee?	-Not at all -A little -Somewhat -A lot -Fully (I do not drink any other brand) -I don’t know -No answer
B4	In choosing your usual brand, what is the importance of each of the following criteria? Attribute number from 0 to 5 to each criterion with ‘0’ if not considered at all and ‘5’ if the criterion is determinant by itself
	Healthy product	Scale from 0 to 5 (+option ‘I do not know’) with ‘0’ if not considered at all and ‘5’ if determinant
	Price
	Taste
	Packaging
	Caffeine level
	Organic origin
	Fair trade
	Tradition/habit
	Local origin
	No choice (e.g., at work)
B4a	Is there any important criterion used to choose your brand which had not been listed in the previous question?	Yes/No
B4b	(If yes to B4a), Please specify what they are
Tobacco consumption
T1	Do you smoke (daily or occasionally)?	Yes/No
T2	(If yes to T1) How frequently?	-Occasionally (less than one per day) -1 or 2 per day -3 to 5 per day -5 to 10 per day -More than 10 per day
T3	(If yes to T1)What do you smoke?	-Manually rolled cigarettes -Cigarettes with filters -Cigarettes without filters -Cigar or cigarillo -Pipe -Other (precise)
Thank you for your participation in this survey.   If you are concerned about this study or about the manner in which your data are processed, or if you wish to contact us about your rights, please first contact Prof. Claude Saegerman at the following address: claude.saegerman@uliege.be