Second-hand
smoke, sure; but I wasn't able to find ANY health risks online relating to stale cigarette
odor. The difference? The second-hand smoke is what others nearby (and even the active smoker) are exposed to when the smoker smokes out on the balcony or patio of a non-smoking
DVC unit. Stale cigarette odor - what you smell INSIDE a DVC or hotel room after a smoker has been there - may, as somebody stated, cause that vaso-something reaction, or immediate breathing issues, but there is ZERO evidence that this smell or odor causes cancer.