your description signals towards a early onset CAD, with features like obesity, smoking
and most probably lifestyle. now a days CAD is appearing in young age also, please go for ECG and other assessment for cardiac health like lipid profile
etc. best thing you can do at this point of time quit smoking, in this you may get help of nicotine
gums available in market(nicotax). Asthmatics are always asked to avoid smoke, dust, fumes etc. ling of pain with smoking may be a incidental finding only. also get workup for gastro oesophageal reflux disease, very common in your clinical setting.