Unmistakable smell grabs your attention August 7, 2002BY RICHARD ROEPER SUN-TIMES COLUMNIST So I'm walking in the Loop early Tuesday morning when the breeze carries a strong scent to me and nearly stops me in its tracks because it's so . . . unexpected. I know that aroma. I can't figure out where it's coming from--but I know that scent. When you smell this particular smell you immediately recognize the smell for the smell that it is, even if you're not someone who participates in the activity that creates the smell in the first place. I'm talking about marijuana. Cannabis,...