I Am Unsure As To Whether I Have Asthma Or

I am unsure as to whether I have asthma or not. It is now winter and I've been wheezing before and during sleep, as well as coughing and having difficulty breathing after exercise. It's been very prominent during the end of fall and beginning of winter, so I am unsure. Also, I am allergic to environmental factors (house dust and cigarette smoke in particular).