ok, my grandfather had heart problems but not till his 30's or 40's, my dad hasnt had any yet, although he does have high cholesterol. im 19, and i have these sharp pains in my chest, usually toward the center, maybe every few weeks, and today they went from there to my left shoulder, and then up the left side of my neck. it wasnt anything that made me drop to my knees or anything, but it deffinetly stopped me, is this a heart attack? and i did smoke for maybe a year as well, and when i do exercise, i find myself unusually breathless, as i used to be very energetic a few years back, but it seems as if i dont have half the breath i used to have.