The 彩票 is a visible and integrated part of daily life.
Buying Tickets: Small, dedicated lottery stations (彩票站 - cǎipiào zhàn) are ubiquitous on city streets and in small neighborhoods. People can walk in, fill out a slip with their chosen numbers (or have them randomly generated), and buy a ticket for as little as 2 RMB.
Common Conversation: It's a light and common topic of conversation. People might ask, “你买彩票了吗?” (Nǐ mǎi cǎipiàole ma? - “Did you buy a lottery ticket?”). After a big draw, colleagues might discuss the winning numbers and lament not winning.
Types of Games: The most famous game is 双色球 (Shuāngsèqiú - “Double Color Ball”), but there are many others, including instant scratch-off tickets called 刮刮乐 (guāguālè - “scratch-scratch-happy”).
Connotation: The term is neutral. It's a normal activity. However, someone who spends too much money on it might be described with a slightly negative tone, as being unrealistic or addicted.