Assertion: smoke | /r/HasProperty | shown
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text: It has been shown that even opening a packet of cigarettes, or offering a cigarette to other people, can increase the level of dopamine (the "happy feeling") in the brain, and it is doubtless that people who smoke form relationships with fellow smokers, in a way that only proliferates the habit, particularly in countries where smoking inside public places has been made illegal.[citation needed]