Cold season: Smoking harms immunity more than heating

Two colds a year: normal, but smoking makes it worse

The cold arrives, and so does the congestion. A healthy adult experiences between two and four colds annually, so those who think they are suffering from a personal epidemic should calm down. However, if this pattern repeats every autumn with clockwork precision, it raises questions. Why do some people struggle significantly with the first sudden temperature drop, while others barely notice?

This discussion starts with a specific case: a slim smoker living in northern Spain, who has noticed more frequent colds since outdoor smoking became common. Their theory is that cold weather is the main cause of colds and that the body defends itself as best it can. The conversation quickly shifted to the factors that truly make a difference.

Smoking: the factor almost no one disputes

Among all mentioned elements, cigarettes fare the worst. Smoke damages the cilia, the structures that sweep the respiratory tract, explaining why smokers catch colds more often and suffer longer-lasting coughs. There is a timing detail that fits: since smoking moved outdoors, people go back and forth between warmth and cold several times a day. Bicho cause colds, not temperatures, but dry cold air dries out the nose, leaving it less protected.

Why do colds coincide with winter?

The short answer is that in winter we spend more time indoors with poor ventilation, creating an ideal ecosystem for transmission. The longer answer involves nasal mucosa: cold, dry air irritates it and reduces its barrier function. Some argue that a cold nose defends poorly, and this intuition is not far off. Cold isn't the culprit, but it is the accomplice that sets the stage.

Sleep, diet, and vitamin D: what remains unproven

Sleep, mood, and nutrition appear in the conversation as usual suspects. Personal experience suggests that poor rest precedes many colds, although the evidence here is more common sense than laboratory data. Vitamin D enters the list due to recent supplementation trends and low sun exposure. And there is a domestic confession repeated in many homes: honey only appears when it is too late.

Cold showers and other boasts

There is always the 'kitchen table' remedy: ice-cold water all year round, suitable only for real men. The irony speaks for itself. Also appearing is the debate on whether colds are caused by unseen microbes or simply cooling down, arguing that language gives it away: *resfriado*, *to get a cold*, *prendre froid*. The name is not etiological proof, though the linguistic detail deserves a moment's attention.

The prediction, with reservations: as long as cigarettes remain lit, winter will continue to exact a toll in tissues.