It's been 5 days since I had lasik. I stopped smoking weed 15 days before the surgery. Can I resume smoking weed from 6th day after lasik?

Weed. You already stopped smoking "weed" for 15 days. How about just stopping this bad habit. If you need help see an addictionologist or go to a treatment facility.
No. A visit to the doctor can help, especially if the doctor knows of successful rehab centers or addiction-medicine specialists, both of which may be helpful to a marijuana user wanting to go cold turkey (stop all use at once). For users with good planning skills and willpower, they can cut out a portion of their use (such as 1/3 or 1/2) every couple of weeks or so, and eventually get to zero use.