Our expert says:
My cat does much the same thing ( well she likes to sniff MY fingers whenever she gets the chancem and sort of reminisces about whatever the trace scents might suggest to her. Young kids engage in a range of self-comforting behaviours, but usually that stops during the ordinary years of childhood.
Asking does raise a relevant point, even if white powder isn't obvious at the time, there's probably a small possibility that drug use could be relevant here. But more likely it's just an idiosyncratic bad habit.
Presumably, someone has drawn his attention to this, and asked him how he sees it ? Some kids twirl their hair, or stroke their forearm, or whatever. So its not necessarily a problem
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