The one thing you need to do:Write an allergy card. It helped me so much in Thailand and I was a lot less paranoid of being served nuts. I researched a bit on the internet and found great forums where people had done this before.
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But peanut, whole, boiled or salted is quite common. As I am Thai,(bangkok) I have known no people who are allegy to peanut. So I would say no it is not common. The most common allergies is seafood (maybe 1 in every 10 of people I known), follow by milk (around 10 people that I known).