Besides cigarette butts, similar sources of poisoning for dogs are nicotine chewing gums, nicotine patches, electronic cigarettes, cigars, and cigarettes
The National Institute for Health and Care Excellence looked at the evidence and stated: Six studies evaluated the safety of NRT in patients with cardiac disease and did not find any increased incidence of cardiovascular events or any other adverse events
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This is bad, because nicotine is addictive and harmful
In conclusion, albeit NRT is not probably harmless, it is surely way less damaging than cigarette smoking