When a person has to increase the amount of a drug to get the same high they have increased their A. tolerance for the drug
B. acceptance for the drug
c. ability to function with less of the drug

A. Tolerance with the drug
Its the same for caffein think about it some people have to drink more to get the same effect because there body’s has developed a tolerance and thats how u get addicted. You have to increase the amount which is addiction.