Background Paragraph: The example of someone having a positive experience with a drug is easy to see how drug dependence and the law of effect works. The tolerance for a drug goes up as one continues to use it after having a positive experience with a certain amount the first time.[38] It will take more and more to get that same feeling. This is when the controlled substance in an experiment would have to be modified and the experiment would really begin. The law of work for psychologist B. F. Skinner almost half a century later on the principles of operant conditioning, "a learning process by which the effect, or consequence, of a response influences the future rate of production of that response.[39]. 
Story: The Weed Winners met to discuss their experiences. They all said they always had a great experience using weed and used the same amount each time. They told how many times they used weed. Laura used it 5 times, Sarah used it 10 times, Kimberly used it 15 times, Deborah used it 20 times, Jessica used it 25 times, Shirley used it 35 times, and Cynthia used it 60 times. 
Question: Who has a higher tolerance for weed: Sarah or Cynthia?
Cynthia.