smoking can cause circulation problems. This can affect the heart and other organs and cause immediate pain and numbness. Even being around smoking can trigger this.
Smoking acclerates the process of fat deposition in the inner walls of arteries which leads to increase in blood pressure and heart rate. This may lead to chestpain.
Smoking cause chest pain becauses your lungs are filled with carbon and other poisions , you must immediatly under go a blood examination and X ray test to confirm that you must not have breathing trouble near future
There is no need of a big explanation to this. You get your lungs and the wind pipe filled gradually with nicotine. This can damage your lungs heart which leads to chest pain and numbness.