nicotine
abstract
abuse
addict
addiction
bio
biochemistry
biology
chemical
chemistry
cigarette
compound
connected
dependency
depression
despair
disease
dots
drug
education
formula
habit
health
illness
laboratory
lines
medical
medicament
medicine
metabolism
molecular
molecule
narcotic
organic
pattern
physiology
problem
school
science
scientific
sick
sign
smoking
social
structural
substance
symbol
system
text
therapy