I'm not sure what it is exactly but I did a little image search and I found the closest thing to this is something called Psoriatic Arthritis.
I personally get something like this (similar) sometimes it's like a scab and it itches but I do have keratosis pilaris (I notice it happens when weather changes and when my arms are exposed to moisture and I do not dry them)
I think you should check up with your family doctor or a dermatologist to check it out for you!
Yes you can! Because the smoke particles will get in either your mouth or nose when you swallow you will get those particular in ur lungs and u will pass for nicotine! Hope this helps…!