I would just ask simple questions... if they would use aromatherapy services if they were available, what scents they like, if they would suggest aromatherapy to others, etc. You could also head up the questionnaire with a brief description of the benefits of aromatherapy and a mention of the cost-effectiveness or the fact that you don't have to take pills, shots, or go to a doctor's office for the benefits. Good luck and I hope I helped!