Steroids are synthetic variations of the male sex hormone testosterone. Narcotics are drugs that in moderate doses dulls the senses, relieves pain, and induces profound sleep.Depressants are drugs which temporarily diminish the normal function of the brain and central nervous system .Hallucinogens are drugs that alter perception and cause hallucinations, or sensations and images that seem real though they are not. Peng is experiencing an increased heart rate and a lack of appetite and he is seeing things that are not there, and he is sweating more than usual. Peng is most likely abusing the illegal drug hallucinogens.