Hi BarryO - They remind me of the old Vick's inhalers that you inhaled when you had a cold. I remember using them as a kid.
Although I don't specifically know anything about these - I would simply recommend caution in case the menthol, eucalyptus, and other herbs were to have an adverse effect. It sounds like it could be fairly powerful, so if strong smells bother you, just be careful.
You might want to ask your doctors opinion; they may have other patients that use them.
Keep us posted.
Regards,
Lyn (site moderator)