cigarettes and brain damage Smoking shrinks the drives up Alzheimer's risk, study finds It causes brain damage!! :

Beta-blockers: Historical Perspective and Mechanisms of Action

However, there are some troubleshooting steps you can take to mitigate the smell while you wait for an AC technician to respond

Alfred Zurhausen

By not investing the necessary time or energy to correctly dry their wood, their wood smoking chunks are left with high moisture content and will not burn efficiently, nor will they produce the same amount of flavorful smoke as Cutting Edge Firewoods kiln dried smoking chunks

And if this odor is coming from an AC vent, you could have a leak somewhere near your air ducts

Something being termed endocannabinoid deficiency syndrome