How To Treat Chest Pain In A Person With Regular Smoking Habit?

Recently i have been having chest pain. I smoke about a pack and a half of cigarettes a day for the last 6 years. I am also a recover ING I.V. opiate user. I was sober for about 19 months then had a slip a couple months ago and have been sober again a few months. If anything my cigarette smoking has increased to almost 2 packs a day in the last few months. I also broke my wrist 6 months ago bc I am an ice hockey player, playing about 3 times a week with 4-5 days of going to the gym a week until I broke my wrist for the last 6 months I have been very inactive. 2 months ago I had to have a bone graft and a screw put in my wrist. I got the cast off last week and am hoping to get active again. So the last couple of weeks I have been having a bad chest pain in the left center of my chest, I guess about where my heart is. It last for about an hour or longer at a time and on a scale from 1-10 it s about a 7. It feels like some one has their hand in my chest and is squeezing something in their fist. I am worried that it is in direct correlation with my smoking as it seems to happen more, the more I smoke. I know I ve pumped a lot of bad stuff in my body over the years but I need some help.