Define tolerance as it relates to physical addiction to a substance?

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Questions

What are the physical consequences of thiamine deficiency in chronic alcohol use
Define tolerance as it relates to physical addiction to a substance?
Describe two types of toxic reactions that can occur with the use of hallucinogens?
What is substitution therapy?
There is speculation that anorexia nervosa may be associated with a primary dysfunction of which brain structure?
What is the level of body mass index (BMI) that is associated with the definition of obesity?
Individuals with anorexia nervosa have a “distorted body image.” What does this mean?
What physiological signs may be associated with the excessive vomiting of the purging syndrome?
What medications have been implicated in the etiology of erectile disorder?
Which physiological mechanisms contribute to sexual dysfunctions?