I've been getting a bad cough for the last few months.. but i think it's been seasonal. I find myself coughing up little packages of greyish/green flem..the result of smoking daily for almost two years now. I don't smoke cigarettes.

Smoking though..lowers your immune system.. so if you've been smoking both cigarettes and marijuana on top of having this viral infection then you're only hurting yourself in the end.
Stop smoking. If you love weed, you'll stop smoking until you have your infection under control...continue smoking with your infection and you run the risk of causing additional or irreversable damage.
Lung problems + ANY smoke = bad news.