False equivalence is a logical fallacy where there appears to be a logical equivalence between two opposing arguments, but when in fact there is none. Journalists use a form of this logical fallacy when comparing two sides of a scientific debate in an attempt to provide a balance between a scientific and denialist point of view. However, there is no equivalence between the two sides, when one is supported by evidence, and the other side with little or no evidence, of which most is of low quality. In other words, in false equivalence, someone will state that the opposing arguments have a passing similarity in support, when, on close examination, there is large difference between the quality of evidence
Marijuana and alcohol are both drugs. An ounce is about the same as three bottles. If you think one should be legal, you should think the same of the other.