The answer is: mental and emotional health.
I hope this helps you!
1) It affects the brain
2) Mental alertness
3) irritability
I don't know, is your dog okay?
Maybe your dog senses that you can smell again and wanted to see for himself :O
Otherwise how did you lose your sense of smell?
If your dog is okay, then give he/she food because maybe they think it is food. Or the other option to to pay more attention because dogs might do that for more attention (play with them more)
Those two are the muscular system and the excretory system because you use your muscles to push up and down and your excretory system produces the sweat you use while doing them
You can overdose or just feel like your on painkillers depending on how much you take also addiction
