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An abusive person (emotional/physically abusive)
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.
Condoms
vaccines
controlled rooms of sick/affected people
10 million people suffer from a lack of Iron or iron deficiency, while 5 million people have iron deficiency anemia in the US.
