Ouch... I'm really against smoking, so putting that first really caught my attention. The laptops part I'm used to, considering people would play games during class all the time. I've never encountered the third though.In every class, I have friends that I can talk to. Since they make us switch for every class, there's nobody that's a constant throughout the whole day. That really killed off a lot of past friendships, but oh well...
Raki, for example, is someone that I barely get to talk to nowadays in RL except for a few minutes in the morning. There are countless others who kind of 'disappeared' since last year, because of the lack of time I get to spend with them.
For classmates in general, I categorize in 3 groups: Friends, People to Avoid, and Neutral. Meh, that's not really official, but at times, it feels like it. Friends are... Friends. People to avoid are stuck-ups, jerks, or just people I don't want to be associated with. Neutral are people I don't mind, and they usually become friends, albeit not very close ones.