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Chemical dependence: Nicotine creates dopamine spikes, making your brain dependent on external stimulation instead of natural reward cycles

They also found health and cognitive function can be improved after quitting smoking, though not completely reversed.

However, CO deprives the heart of oxygen, making the pulmonary system work vigorously

Oral tobacco is a major form of tobacco addiction and can lead to the following [9]: Cancer of the oral cavity, oesophagus and pancreas due to the presence of at least 28 different cancer-causing substances found in chewing tobacco

They point to the public health benefits of snus use in Sweden