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In cases where walls and ceilings have been exposed to cigarette smoke for a prolonged period, simple fixes like scrubbing are typically ineffective
Dose-Response Association of Low-Intensity and Nondaily Smoking With Mortality in the United States

Nicotine/Tar: 0.6 mg / 8 mg

Within-subject comparison of [(11)C]-(+)-PHNO and [(11)C]raclopride sensitivity to acute amphetamine challenge in healthy humans
Neurosci Res (2014) 79:4151