1 = Most serious 6 = Least serious
HENNINGFIELD RATINGS
Substance Withdrawal Reinforcemt Tolerance Dependnce Intoxictn
----------- ---------- ----------- --------- --------- ---------
Nicotine 3 4 2 1 5
Heroin 2 2 1 2 2
Cocaine 4 1 4 3 3
Alcohol 1 3 3 4 1
Caffeine 5 6 5 5 6