cigarettes contain carbon monoxide Mayo Clinic Q and A: Toxic chemicals from remain toxic in secondhand smoke Tobacco smoking - Wikipedia

When smoking it is little noticeable

If you do not have or cannot find TSP, look for TSP-PF, which is the product without phosphate

Key takeaway: HEPA alone solves the particle problem in tobacco smoke but leaves the chemical gas phase entirely untreated

The reason for its resounding success is probably the high quality, technical innovation, high design standards and the integration of cotton filters , which perfectly copy the filter attachment of the tobacco cigarette

[Source: Pubmed, Pubmed] Other compounds in cigarette smoke have also been shown to impact gut health

Smoking cessation programs can help a person quit smoking