It's been four days after lower left molar extraction, is there a risk of dry socket if i smoke?

Be careful: you already know about dry socket so why create problems by smoking which will interfere with proper healing Wait til it all heals or even better yet this would be a good time to quit smoking - just trying to keep you healthyz

Moderation: Obviously we encourage people to refrain from smoking. If you choose to smoke be very gentle on inhaling as the suction created from sucking can cause the blood clot to dislodge and this is what causes the dry socket. Usually this happens in the first week of treatment. If you can refrain from smoking for a few more days it would be beneficial. Hope this helps!

Not recommended: Smoking is the leading cause of dry sockets I suggest no smoking for at least additional 3 days. Use this great opportunity to stop smoking permanently.

Yes: Yes. Wait 7 days after extraction.

Wait: Smoking impedes healing. Give it a week to 10 days. And if you can go a full wee, try for two, then three, etc. You know all the reasons why not to smoke, the chief one being that it will probably kill you. So please try to quit.