###Human: Can second-hand smoking cause any lung or heart problem? ###Assistant: Hi. Second-hand smoking is problematic sometimes but the amount of time you inhaled will probably not have any effect on the lungs. But it can affect if you have to stay with them every day for a couple of hours. Even then a significantly longer period of time is needed like months or years actually to damage in long-term. But yes, short-term side effects like a cough and a headache can happen, temporarily and goes away once you are off the site.