I am wondering if "sniffing" is being taken out of context by some, a bit like equating "a light drizzle" as a"downpour."
I am female and I sniff anything that seems like it could be pleasant (within reason.)
Females can do this lots- we sniff candles and foods and wave flowers under the noses of other people saying, "smellll thissss one".
I can't think right off hand of any males that do it quite that much or just at random like we do but I'm sure some do.
If I'm in line at a grocery store and someone has a nice cologne on then I may scoot a bit closer and discreetly be able to smell it OR if feeling especially bold could (but I'm not actually that brave, lol) lean in and back out very quickly while giving a compliment.
(That could be sketchy if not done very carefully and I'm shy.)
However, I met a teenage boy once who was severely impaired from MR and he sniffed people, but in a different way than what is normal.
I was sitting across from him at a table and he quite unexpectedly came over to me and got close enough for his nose to graze me and sniffed me, very slowly, all around my head, neck, arms and any other place he could easily access up high.
The lady with him told me he was doing that because he liked me and wanted to smell me to see if he approved.
When he was done, he stopped as suddenly as he had begun and retreated back into what he was doing previously (rocking out with his headphones on) and never communicated with me beyond that.