Yes, I also thought about that...why is the number of deaths so much higher in Italy? I also thought of pollution, smoking, etc. and the demograpy in Italy is different from China and other asian countries. Even for a European country, Italy has many people in higher age.
Furthermore, Italy was the first country in Europe that got a bigger problem with the virus. Probably, they were a bit of surprised and, therefore, took the necessary actions too late. Another assumption of me is that maybe the mentality of Italian benefits a fast and wider spread? Italians are very sociable and the greeting (within family for example very warmly...few little kisses on the cheek, left and right, sometimes on or close to the mouth etc.) might also trigger the infection to another person easier than a handshake or a little hug - I am not a virologist, just my non-professional assumption that all those little things contribute to a wider spread
Edit: I just noticed that gemima posted (parallel to my post) the same assumption. So, I am not alone with my assumption
Another assumption why there are far less death cases for example in Germany so far although they also have an aging society and many older people in their population: After a very few China-visite-related cases, most cases appeared in Nordrhein-Westfalen which is one of the German regions where carnival is celebrated extensively. Experts tell that the virus spread so quick lately in Germany because of carnival infections. Since, in Germany, carnival is celebrated mostly by younger people (or at least less than 60 years or so), it might be that especially younger people got infected in Germany. And since the people are aware of the situation in Italy, they tend to be more careful (go to a doctor in an early stage, stop meeting older relatives, etc.) so that, even until now, a smaller share of infected people are in an older age (compared to Italy).