A little . . .
The most important thing is to do what YOU want: eat/drink what YOU want and how YOU want to eat (or drink) it.
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Cigarettes? Not acceptable anytime. Period. (Then again, I live in California. If I lived in Greece, I’d probably smoking at any time of the day or night was not only perfectly acceptable but mandatory!)
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It seems to me that the consumption of such things like coffee and alcoholic beverages is situational. For example, if I’ve been outside working in 104° heat for an 8-hour shift, I’ll slam down a 16-ounce can of Bud before starting my second shift. On the other hand, I typically a) never drink Budweiser, and b) drink my beer(s) with lunch – think a dozen oysters and a soft shell po’boy in New Orleans.
Coffee? I start off my day with a double espresso as I feed the dog and empty the dishwasher. Then, I’ll make two lattes and take them back to our bedroom, so my wife and I can have coffee in bed while sorting through emails and getting ready for the day. After eating lunch, I like to have coffee, which may or may not have some food accompanying it . . .
Wine? What kind of wine?
When it comes to sparkling wines, or fortified/flavored wines, I’ll often have a glass of Champagne or other sparkling wine as an aperitif by itself, but it also may be served to accompany appetizers. Same thing with (e.g.) a Fino Sherry. Generally, if I’m having Spanish vermut, it’s going to be as an aperitif and served by itself, whereas a glass of Porto Branco (White Port) will be served with appetizers/charcuterie. Depending upon the type of Porto Tinto (Red Port), I may savor it by itself, or served it with a cheese course.
Table wines general are always served with a meal, except when they aren’t. I may, for example, have a glass of wine by itself in a wine bar, or while cooking . . . but generally, the bottles of wine I open at home, or order in a restaurant, are to accompany the meal we’re sharing . . .
But there is no right or wrong here, so go forth and do what you want . . . .