Final answer:
The smell of cannabis alone is not an indicator of intoxication, as intoxication involves several altered mental and physical states. While it denotes the presence or recent use of cannabis, it cannot reliably measure intoxication levels like a Breathalyzer test does with alcohol.
Step-by-step explanation:
The presence of the smell of cannabis does not automatically indicate intoxication. Intoxication from marijuana involves alterations in the functioning or state of the brain after using cannabis. Signs of intoxication include altered senses, such as seeing more vivid colors, altered sense of time, changes in mood, impaired body movement, difficulties with thinking and problem-solving, memory challenges, and increased appetite. The smell alone is insufficient evidence for intoxication; it simply indicates that cannabis is present or has been used nearby. Furthermore, unlike alcohol detection where the Breathalyzer reacts with ethanol in the breath, there is currently no similar reliable roadside test to measure cannabis intoxication levels.