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Animal experiments and studies in humans indicate that smokeless tobacco has mainly short term effects resulting in increased blood pressure and heart rate that are presumably due to nicotine, whereas data on long term use and hypertension are inconclusive.3 4 Several studies suggest that increased levels of triglycerides, diabetes, obesity, and metabolic syndrome might be associated with use of smokeless tobacco.1 4 Experimental findings of increased damage to the cardiac muscle and poorer myocardial healing in dogs exposed to nicotine may provide a pathophysiological rationale for the increased mortality from myocardial infarction

7 And those who have smoked more than a pack daily or smoked for more than 30 years have a 48% increased rectal cancer risk

For instance, 2 large meta-analyses were unable to depict an effect of smoking status on response to infliximab [22,23], and smoking, if anything, may have a positive impact on thiopurine metabolism and related treatment response

Formaldehyde is a colorless, flammable gas that has a distinct, strong smell