What Does Heroin, Bath Salts, And Meth. Smell Like When

What does heroin, bath salts, and meth. smell like when smoked. I live in a condo where there
are drug dealers and prostitutes and once in awhile I smell a very slight chemical order. It is very
pervasive though...not strong at all. It kind of smells similar to the taste of an anesthetic once
used on me for a medical procedure and I could taste in my mouth.
Thank you.
Sandy