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A person who combines alcohol and cannabis may indeed show signs of intoxication faster than someone who only consumes alcohol. This is due to the way both substances affect the central nervous system. Alcohol can enhance the psychoactive effects of cannabis, leading to an increased level of impairment. The interaction between the two substances can produce heightened effects, which might not occur with either substance alone.

Furthermore, the combination can lead to greater physical and cognitive impairments such as reduced coordination, altered judgment, and impaired reaction times. This heightened effect can lead to quicker onset signs of intoxication.

The notion that the response can vary from person to person is valid; everyone metabolizes substances differently due to various factors like body weight, tolerance, and individual differences in biochemistry. However, the general trend is clear that combining these substances typically leads to increased impairment.

Therefore, the assessment that individuals using both substances may display signs of intoxication more quickly is well-supported by research in the field of substance interaction.