Vacuum again
Make sure to use a mild shampoo and thoroughly dry the interior to prevent mold growth
In 1962, a report of a committee of the Royal College of Physicians in Great Britain declared, cigarette smoking is a cause of lung cancer and bronchitis, and probably contributes to the development of coronary heart disease and various other less common diseases. In January, 1964, a report issued by a select advisory committee to the Surgeon General concluded that cigarette smoking is causally related to lung cancer in males
Studies have shown that smoking can be harder to quit than opiates, cocaine, or alcohol
My answer to that is, sure its just about as safe as smoking anything, which is, not very good for you at all
Avoid prolonged exposure: Minimise the time spent in smoky environments whenever possible