Sometimes. In certain patients when nasal obstruction leads to mouth breathing and mouth breathing leads to snoring the nasal strips can be helpful. The only way to know is for you to try them. Make sure you wear them a little bit lower than the nasal strip people recommend. Where they tell you to wear it is too high - wear a little bit lower on your nose you will have more success.
Not likely. Nasal strips can help open your nostrils to improve airflow, which is good, but the snoring obstruction is most likely occuring elsewhere in your throat area. You may try simple things like sleeping on your side, but you might also consider a sleep study to rule out sleep apnea. If not apneic, you might consider an oral appliance to reposition the mandible and tongue to decrease snoring.