a.Affect mood, sensation, thought, emotion and self-awareness; alter perception of time and space; and produce hallucinations and delusions b.Produce mood-altering effects similar to those of alcohol; found in glues and solvents c.Slow down the physical activities of the brain, producing temporary feeling of relaxation d.Speed up the physical and mental activity of the brain, producing temporary feelings of alertness and improved task performance e.Relieves pain f.Produces feelings of elation, disoriented perceptions of time and space and impaired judgement.

Hallucinogens are any drugs that cause a distortion is a person's perception of reality, which we typically call hallucinations. An example would be LSD.

Inhalants are substances that produce a chemical vapor which, when breathed (inhaled), provokes mood alterations. As said in the question, those substances can be found in glues and in solvents.

Depressants and stimulants are each other's opposites. Depressants are used to reduce arousal while stimulants are used to provoke it.

Narcotics are opioid painkillers. They are stronger than the regular painkillers we use and may end up causing addiction.

Cannabis products are used both recreationally and medically. The common symptoms are euphoria and hunger for recreational users. Medically speaking, they may also be used as pain relievers. In some cases, they are even used to combat depression or anxiety.