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Consuming alcohol and cannabis together can lead to increased impairment of motor skills. This is because both substances affect the central nervous system, and their combined effects can amplify the overall level of impairment. Alcohol is known to slow down reaction times and reduce coordination, while cannabis can impact judgment, concentration, and motor performance. When used together, these effects can compound, resulting in a greater risk of accidents and impaired driving.

Regarding the other options, consuming these substances does not lead to increased alertness; rather, it generally results in sedation and drowsiness. Additionally, it does not decrease the likelihood of intoxication; rather, the combination can heighten the intoxicating effects, making a person feel more impaired than when using either substance alone. Finally, cognitive function is not improved; in fact, combining alcohol and cannabis often leads to diminished cognitive abilities, including memory and decision-making skills.