Not saying it’s the best smell(some may disagree) but is there anything more pungent to the human hooter than weed? Even outside it lingers for ages over a wide area.
Let’s just ask.
Weed smells strong due to a combination of chemical compounds, primarily terpenes and volatile sulfur compounds (VSCs), which easily evaporate into the air. This strong scent is an evolutionary adaptation for the plant's survival and is often an indicator of quality.
You know it makes sense! 
