Can arrhythmia or tachycardia caused by a panic/anxiety attack lead to cardiac arrest or cardiac event if so what age gender and race is more at risk?

Not usually. . Typically stress/anxiety causes the heart to race by activating the "adrenaline" part of the nervous system. Only in rare conditions like long qt syndrome does this cause serious arrhythmias. Since you smoke your risk of heart artery blockage is greater than that for a non-smoker.