Are kitchen smokes bad for your lungs? like when you're cooking meat and then smoke fills the whole room?

It would depend on the chemicals that are in the smoke. Just buring meat is not a cause for concern. What is causing the smoke? What are you burning? Are you able to open the windows to clear out the smoke? Could you use a fan to blow out the smoke? Is it feasible to install an exhaust hood over the stove?

Maintain good ventilation, avoid smoke exposure. I agree that the composition of the smoke is important, but smoke exposure may cause bronchospasm.