A team at Otago University have been looking into that were joined by one of the team, Professor Richard Edwards.
To be honest, Id probably be okay smoking in my room, since I roll my own cigarettes (MacBaren Choice, if anyones interested)
The main reason is nicotine and tar
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Although there are tobacco retailers countywide, there is a higher concentration in neighborhoods with a higher percentage of low-income residents or people of color, according to Santa Clara County Public Health