Hi welcome to healthcaremagic
The pain in the left arm , is not due to the heart problem.... the pain is also not related to the smoking
.... it also not related to smoking of your mother when she was carrying you ...The pain may be due to Neuralgia
, origin from nerves... one of the cause may be due the compression of nerve root
at cervical region... If the pain is from muscular in origin it will be relieved by analgesics... do not worry much about it... it is good to quit smoking, since it will have harmful effects to your health in late age...