**Chemical Agent**: Substance that induces a chemical reaction.

**Pharmacological Compound**: Drug causing physiological changes in organisms.

**Biological Influencer**: Factor affecting biological processes or functions.

**Psychosocial Stimulus**: Element influencing emotions or social behavior.

**Environmental Modifier**: Component altering environmental conditions or effects.

Influential in causing change or effect.

Capable of impacting emotions or feelings.

Having a significant impact on outcomes.

Possessing the power to modify behavior.

Affecting health, mood, or well-being positively/negatively.