does cigarette smoke produce carbon monoxide Did you know? (CO) is the main substance we're concerned about when it comes to smoking in pregnancy. CO is a poisonous gas you can't see or smell. It reduces Chemicals in Cigarettes and Tobacco:

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Here's What the Science Says UTSW/Nicotine Cessation Program Interview highlights were lightly edited for clarity

Particles from e juice that have been vapourised are much larger, so dont penetrate the body as deeply

They have not

Animals naturally avoid breathing cigarette smoke, so lab rats are forced into tiny canisters, and cigarette smoke is pumped directly into their noses