This should provide you the information you need: https://www.paypal.com/webapps/mpp/ua/useragreement-full?country.x=US&locale.x=en_US#13
Quote from that page: (out of context, please read section in it's entirety)
From what I read, as long as you file a dispute within 45 days of when the funds were sent, you should be ok. Let me also state this, do not ever at any point mention anything about e-cigs or e-cig related items! They will not honor the dispute because they consider these items to be illegal. How long you wait or allow the person to respond is really a personal preferences. If it is a large sum of money, I would probably be quick to dispute if I felt the person had ample time to respond and the opposite for lower amounts of money. So what ever makes you more comfortable is what is best. I do ask when you file a dispute on a Verified Member on the forum, please file a complaint against that member to prevent them from scamming anyone else.
yup i already did both after i posted here, i guess i just wondered if there was any particular other protocol, but i guess not. seems i wasn't the only one ripped off by that person.