chewing tobacco does not cause cancer Can You Get Oral from Tobacco? Tobacco Use and Oral Health:

Studies have highlighted the impact of nicotine on sperm DNA methylation, indicating variable methylation levels at specific genetic loci or CpG islands leading to potential adverse health outcomes in offspring, such as increased spontaneous locomotor activity and attention deficits by altering methylation levels in the promoter of Dat 20,21,22

As e-cigarettes are relatively new products, many long-term health effects of vaping are still unknown, studies have shown that vaping is associated with increased risk of developing heart and lung diseases in the short term, such as myocardial infarction, asthma and chronic obstructive pulmonary disease (COPD) [10]

Chewing pan masala and/or betel quid-fashionable attributes and/or cancer menaces

Lammel, Liu, graduate student Amanda Tose and their colleagues described the brain circuits involved in nicotine aversion in a paper accepted by the journal Neuron and now posted online