I’m very sensitive to menthol, and it is also a sensitising compound. Some people may well find they get more intolerant rather than getting acclimatised. I would suggest that anyone struggling with menthol in any way, be it irritation, rebound, or just the scent being overwhelming, to try and minimise exposure to it, or only use it when suffering extreme congestion. I have thrown out most of my menthols, although I have kept a few back for medicinal use.