does tobacco show on blood test Biochemistry Analysis to Detect Smoking Status and Quantify Accelerated Aging in Smokers Smoking Effects on Blood Tests
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15 However, some studies found that in extreme cases of heavy exposure (long duration in an unventilated space) nonsmokers had positive tests for THC in oral fluid and blood up to three hours following the exposure

No, the sale of snus is currently illegal in most of Europe, including the UK
A negative result means nicotine or cotinine levels are below the detection limit
Many people also put much less tobacco in a self-rolled cigarette
Research on microplastics indicates they accumulate in human organs, and evidence is emerging that this could be harmful

Cardiovascular Toxicity of Nicotine: Implications for Nicotine Replacement Therapy: Benowitz