As www.webmd.com says Being around tobacco smoke is bad for you, even if it's someone else's smoke.

When someone smokes a cigarette, most of the smoke doesn't go into their lungs . It goes into the air, where anyone nearby can breathe it.

Smoking  is banned in many public places. But many people are still exposed to secondhand smoke , especially children who live with parents who smoke. Even people who try to be careful about where they light up may not protect those around them.

Tobacco smoke has more than 4,000 chemical compounds, at least 250 are known to cause disease.

Suppose that you live with someone who smoke atleast 3 days in a week  near by you,  www.webmd.com says that you have an increased chance by 30 percent to have lung cancer. 

This Smoke will  make your blood  stickier, raises your bad LDL cholesterol , and damages the lining of your blood  vessels. Eventually, these changes can make you more likely to have a heart attack or stroke.

There are plenty of disoders in our body functions that occur by on only working with a friend while he or she is smoking. 

Some policies emphasize only on not smoking in public. But as we have came to see from above explanations it is not even good at all smoking in a place where a single person can pass by.  

Yes, it is so bad to smoke at a public places because you are killing many people at once, but it is not good also to smoke in these places like home (because the people who live with you being infected slowly). Oh you are saying that you live alone and may be you can smoke you won't kill anyone. No  came on stop being naive,  smoke if  you are sure that no one will ever came to your house to go away with lungs cancer. 

The policy I would like to suggest is increasing the taxes on Tabacco so that some money will go to help in hospitals by saving those who got cancer from smokers.