One of my science teachers in high school had this done while I was in his class. Missed a week or two and came back so different. Way happier in almost every way.
It was hilarious because he would tell people not to sniff any noxious fumes from any chemical things we did, but then I would notice him sometimes sneaking a sniff real quick and then smiling afterward. Just because he could smell it now, and even though it was definitely not healthy, he did it anyway and it made him happy.
Good luck OP. Hope it helps.