LocationsThe impacts of feeling lonely: Is it the new smoking?
May 13, 2026
Unwanted loneliness is far more than a state of mind. It is a social phenomenon emerging in a context marked by a troubling paradox: while machines are becoming increasingly intelligent (even if we do not fully understand what happens inside that “black box”) social connections are being threatened by multiple structural factors that manifest differently across life. Among the factors contributing to this trend are changes in workplace dynamics, including work-life imbalance and remote work arrangements; growing technological dependence and the replacement of face-to-face interactions with passive forms of consumption; population ageing; cities that continue to grow without prioritizing human-scale design; increasing social pressure toward individual autonomy; and the disruption of social bonds caused by the COVID-19 pandemic, among other phenomena.
Social disconnection, however, is not just another development challenge. It strikes at the very core of what makes us human: we are social beings who need one another. Since the origins of our species, survival has depended on living in groups, where cooperation was essential for obtaining food, protecting one another, caring for and raising children, and ultimately expanding across the planet. In this sense, loneliness functions as a biological alarm, much like hunger signals the need to eat or physical pain warns that something in our body is not functioning properly. Social rejection, in fact, hurts and the brain processes it in the same region associated with physical pain.
Loneliness also has profound consequences for health and longevity. People with weak social ties are 50 percent more likely to die prematurely. Its impact is estimated to be twice as harmful as obesity and four times more damaging than living in a highly polluted area. Some studies have even suggested that feeling lonely is equivalent to smoking fifteen cigarettes a day. Could loneliness be the new smoking? When persistent, loneliness is also associated with the development of chronic conditions such as type 2 diabetes, cardiovascular disease, and hypertension. It increases the likelihood of heart attacks and strokes by nearly 30 percent. For these reasons, loneliness is increasingly being recognized as a public health epidemic, one that often grows silently.
Loneliness is not limited to physical health impacts. It can also push people into a state of hypervigilance, reinforcing cognitive biases that lead them to perceive threats or criticism even in neutral situations. It is a significant predictor of depression and suicidal ideation. People who feel lonely often struggle more to ignore distractions, persist with difficult tasks, and regulate their emotions in ways that prevent impulsive behaviors. Conversely, the longest-running study on happiness—conducted by Harvard University for more than eighty years —has consistently found that the quality of our relationships is the strongest and most universal predictor of well-being.
The effects of loneliness also accumulate throughout life and extend into educational and professional settings. It has been associated with absenteeism, lower productivity and performance, and a higher likelihood of unemployment or early school dropout. Beyond its individual consequences, loneliness also poses a challenge to democracy. It fuels polarization, weakens trust between people, erodes the sense of belonging, and reduces willingness to engage in collective life, all of which are essential foundations for social cohesion and democratic coexistence.
For all these reasons, perhaps it is time to take loneliness more seriously and act collectively before it becomes even harder to engage in dialogue, cooperate, and build shared solutions. At UNDP, we want to contribute to this public conversation. To that end, we mapped more than 100 initiatives designed to address loneliness around the world. The selection was based on several criteria: the explicit recognition of loneliness among the initiative's objectives, its inclusion in national or local strategies, the existence of evaluations demonstrating effectiveness, and its potential for replication in other contexts. The diversity of the initiatives analyzed—which varied in origin, scope, approach, and time horizon—reminds us that there is no single solution to a challenge as complex as loneliness. Through this line of work, we seek to highlight that social connection and well-being, although intangible, are also legitimate and necessary public policy objectives.
