It's funny how they classify these as "pollutants":
Scientists have discovered particles of cocaine and marijuana, as well as caffeine and tobacco, in the air of Italy's capital, they said on Thursday.
http://news.yahoo.com/s/nm/20070531/wl_nm/italy_drugs_dc
Scientists have discovered particles of cocaine and marijuana, as well as caffeine and tobacco, in the air of Italy's capital, they said on Thursday.
http://news.yahoo.com/s/nm/20070531/wl_nm/italy_drugs_dc