I'm allergic to a lot of things: tobacco, THC, wool, brazil and macademia nuts, cats, dust, ragweed. I have seasonal allergies too. Seasonal allergies make me feel like I have a cold most times. The other things vary. The nuts are very very dangerous to me, wool makes me break out, cats/dust/ragweed makes me sneeze and my eyes water, and tobacco smoke make my eyes water, cough, and my throat hurt. Actual tobacco (my father worked at a cigarette company) makes me sneeze and I break out when I touch it.
I used to have asthma attacks when I was younger around smokers, but that stopped many years ago. Now my throat gets sore when I'm around smoky places and I cough a lot. If i spend an evening in a smoky bar, I am almost always ill the next day (fatigued, sore throat, and coughing)