Travel / The cheapest way to travel to Poland from UK? [6]

I live in the UK and am thinking of going to Poland on holiday, I have heard that there are buses going there but how long do they take and how much do they take?

Also what are the price of marlboro cigarettes there at the moment as i was thinking of bringing some back, if someone could tell me how much they are in £'s?

Also what is the best city to visit?

And if flying is the best from what airline, i live in Cardiff!

Many thanks