It causes breathing problems, cancers, organ damage, changes your appearance for the worst, it smells bad, some of your friends may not want to be around you as much if they can't stand the smoke (like asthmatics), it can kill you, leaves a bad taste in your mouth, it costs a lot of money long term, and it is an addiction that is very hard to get rid of. The worst part is that you can also injure those around you in the same way with secondhand smoking.
The answer is should be D because A includes food tracking, B includes your feelings which is really a diary, C you fitness log should not have picks of ur friends. So that leaves me with D.
burn effects like blisters are caused by heat, not temperature. So basically that steam at 100 C contains more heat than water at 100 C but More severe, burn effects come from the gaseous water than the steam.
hopefully this helps, and i deeply apologize if i got this wrong for you
