is tobacco an upper or downer nicotine a stimulant a depressant? Tobacco companies have made cigarettes

Some even contain flavoring chemicals like diacetyl , which has been linked to a serious lung disease known as popcorn lung. Theres also a dangerous condition called EVALI (e-cigarette or vaping product use-associated lung injury) that can cause severe inflammation and scarring, much like pneumonia

Athletes and even Fred Flintstone endorsed cigarettes in TV commercials

Those who did not respond to the invitation within two weeks were contacted again by a telephone call by a staff member of the SPHS operations team

Whats causing it

Talk to your HVAC technician if this is a concern

The most common side effects include: Headaches - Usually mild and often dissipating within 2 hours