some studies have revealed that it does weaken the immune system
No
Yes it will.
steroids
Your immune system cant produce antibodies for infections/viruses if it is not exposed to them.
Hemoglobin
Yes, burns of all sorts do weaken the immune system to some extent. The higher the degree the burn, the more susceptible you are to infection because of the exposed raw skin.
Yes. Anorexia can weaken the lungs. It can also weaken the immune system, making the body more prone to respiratory infections.
There has not been any medical side effect of lowering the immune system, if think it has given this side effect to you, contact your doctor about it.
HIV attacks your immune system. When your immune system is fighting it starts to weaken. The Antibody start to take over which then turns to AIDS.
Depends. How much tobacco do you chew? If you chew some maybe every once and a while it's probably won't, but if you chew a whole lot, there's a better chance it will weaken your immune system.
It would be a compromised immune system.