To me, your question/scenario is a little unclear. Are you talking about a single line of vehicles where you wind up between the first car at the light and the curb, or are you talking moving up in between two lines of cars?
If the former, a car that abruptly and unexpectedly decides to turn right instead of going straight could really ruin your day.
Besides, car fumes aren't all that bad. Sit back and enjoy the high!