I got a tooth extracted monday morning and haven't smoked since last friday. can i smoke without risking a dry socket?

No: It may be fine, but depending on the nature of the procedure, previous infection, location of extraction, the risks are not 0%. Try to refrain as long as possible.

Yes, unfortunately: Unfortunately for your lungs, cheeks, lips, tongue, teeth and overall health, after this much time you can safely smoke. You shouldn't, but you can. Since you've been able to go a week now without smoking, why not just quit?

Should be OK: I can't tell you that you will not get a dry socket smoking or not. If you are comfortable and not bleeding, you should be able to smoke.

Dry Socket/Smoking: Smoking is bad for your health and teeth. Generally speaking, a dry socket is avoided by a few precautions which smoking is one of them. If you do not get a dry socket in the first 24hrs post extraction, you are safe to smoke.