Hypnosis
Tolerance
the diminishing effect with regular use of the same dose of a drug, requiring the user to take larger and larger doses before experiencing the drug's effect
the discomfort and distress that follow discontinuing the use of an addictive drug
physical dependence
a physiological need for a drug, marked by unpleasant withdrawal symptoms when the drug is discontinued
psychological dependence
a psychological need to use a drug, such as to relieve negative emotions
addiction
compulsive drug craving and use, despite adverse consequences
drugs (such as alcohol, barbiturates, and opiates) that reduce neural activity and slow body functions
Stimulants
Drugs (such as caffeine, nicotine, and the more powerful amphetamines, cocaine, and Ecstasy) that excite neural activity and speed up body functions.
Hallucinogens
psychedelic ("mind-manifesting") drugs, such as LSD, that distort perceptions and evoke sensory images in the absence of sensory input
Barbiturates
drugs that depress the activity of the central nervous system, reducing anxiety but impairing memory and judgment
Opiates
Stimulants
Cocaine
Hallucinogens
LSD
Marijuana
Biological influence