If you accept the conclusions of the study you should probably never leave the safe confines of your home. While nicotine was present in all venues it was on average thirty one times higher in smoking-allowed venues. This, they say, is proof that the air in these venues is deadly. What they left out of the press release that the nicotine levels were, at worst 500 times safer than OSHA standards in the establishments tested. Even at 31 times higher, it is still 500 times more dilute than would be considered harmful by OSHA. These are not arbitrary numbers but rigorously-tested standards developed by OSHA for all environments.
The other "finding" in this study is that they were surprised that establishments with ventilation had higher levels of nicotine.