'Soft drugs include:
LSD
Mescaline
Magic Mushrooms
Marijuana

You then have drugs that cause a low amount of physical addiction and are moderately toxic. That mid range group includes:
Caffeine
MDMA(ecstasy)
Ketamine
GHB

Then you have the top group of hard drugs, which are fairly physically addicting and fairly toxic, this group includes:

Alcohol
Nicotine/tobacco
Methamphetamine/Amphetamines
Heroin
Cocaine/Crack
Oxycodone/Vicodin/Px Opiates'