Totally.
Be careful about any unknown wireless network you connect to.
I read a study a while back, where airports around the country were monitored and they found rogue ad-hoc networks in almost all of them. People go in, and setup a wi-fi ad hoc network and wait for people to join... then they sniff all outgoing traffic for information. The sky is the limit with that setup.
If you need wireless internet, your best bet is to have an internet capable cell phone and tether your computer to its internet connection, or get a cellular modem.
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