Have athma since childhood and I have been sniffing stims for the last 8 years with no issues. I smoke cigs as well but don't smoke anything else.
I avoid smoking meth due to athma, but oral and nasal is fine and doesnt cause any issues. To clarify I have milder activity induced athma (oxidative stress linked).
If i had heavy attacks I would prob avoid any street stuff.
I think my asthma is more mild... if fact i did a lung test last night and the tech that was doing it says he doesnt even think its asthma????? (yet i end up in the ER almost puking from coughing and short of breath with a tight chest???) . He thinks this because my lungs seemed strong and the test normal??? oh well i see my doc on thurs so because something aint right. thank you all for your replies they are most apreciated. its funny i was snorting lorazepam for a week with no issues. Maybe im just allergic to smoke from all the smoking of various substances during the last 10 years