Good point but anecdotally I think there is something here. Most of us have the experience at some point in our lives when an unusually-encountered smell evokes an event or earlier period in our lives. Many people report that this then links to a further array of memories. Nothing unusual about this. Proust famously described this in his extensive magnum opus 'Remembrance of Things Past' and so have many other authors to a lesser degree. So it's more than 'perhaps interesting'; there's plenty of circumstantial evidence that exposure to such chemicals might work to renew lapsed connections.