nicotine
addiction
anatomy
background
bad
brown
cancer
care
chemical
chronic
cigarette
cigarettes
concept
danger
dangerous
day
design
disease
dry
flat
forbidden
habit
health
human
lay
lung
lungs
made
medicine
no
object
organ
pollution
quit
quitting
risk
shape
smoke
smoker
smoking
stop
support
symbol
tobacco
top
toxic
tuberculosis
unhealthy
view
warning