Having to use more of a substance to feel the same high is tolerance and this is due to addiction.
What do you mean by addiction?
- "It is the fact or condition of being addicted to a particular substance or activity."
- In this an individual despite knowing the consequences cannot control themselves to use a substance.
What is tolerance?
- "Tolerance occurs when a substance gradually loses its effectiveness over time."
- In this the person's body get use to that substance.
- Due to this, the person now need a substance in high dosage in order to feel same high/effect.
Hence, the correct answer is: tolerance.
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