Stomach reflux

Hello. I have been smoking for 10 years and lately I was smoking about 6 cigarettes a day and I had stomach reflux problem until I decided to vape. I started vaping about seven months ago and I used nicotine salts 30 mg. I recently realized My stomach reflux problem has worsened. I wanted to know if this happened because of too much nicotine? And if it is better for me to use regular juices with 3 mg nicotine