The findings reported in the journal Addiction do not necessarily mean that there is something about being a night person that raises smoking risk.
Researchers say one possibility is that nicotine , which is a stimulant, may tend to keep smokers up at night.
Another study says that tobacco could make your memory go up in smoke. The report in the Archives of Internal Medicine connects heavy smoking in mid-life with a dramatic increase in dementia later on.
Those who reported smoking more than two packs a day had a 100 percent greater risk of dementia diagnosis than non-smokers.