from cigarettes can cause increased heart best and put pressure on the heart. Even passive smoking
, that is, inhaling the smoke exhaled by others, exposes the body to nicotine and other harmful substances present in smoke. That is probably why you feel the same symptoms when others around you smoke. Since passive smoking also harms that heart and the rest of the body, it is always better to avoid the company of people who are smoking.
Hope this helps you. Best wishes.