I just had a surgery related to varicocele 2nd grade and doctor said i should stop smoking weed for ever , but i don't see why , can i be smoking again aftera month from now at least ?

No. Marijuana is a psychoactive drug and will mess with your brain. MJ users are called stoners for good reason. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health!