nicotine
addiction
air
anatomy
asthma
background
breathing
bronchi
bronchitis
cancer
care
cigarettes
composition
cough
creative
dangerous
disease
drawing
flat
habit
harmful
health
human
illness
lay
life
lungs
made
medicine
object
oncology
orange
organ
paper
pneumonia
problem
pulmonary
respiratory
shape
sickness
smoke
smoker
smoking
stub
tobacco
top
trachea
treatment
unhealthy
view