I loved these 'sweets' when I was in labour, (it was a 48 hour job, so anything that stayed down was appreciated!) and now my daughter likes them when she's had a fright, gotten hurt or is otherwise upset. They say that they are ideal for coping with exam stress, driving tests, first day of school nerves, job interviews and high pressure environments.
A lot of people don't believe them to be any more than a placebo affect, but others swear by them. Wherever you fall in that camp, they've been around for nearly 100 years, and are much loved by users. I'm not sure how much they send in the sample, but as they're normally around £10 for a tin, it's a great opportunity to try them for free.