Most dispensaries these days do have weaker products, often sold as CBD forward strains for sleep or stress. But the vast majority of people do just smoke less of the stronger weed. If you are taking small, shallow hits and not holding it in and it's giving you anxiety, weaker weed probably won't be any different, versus just looking for a mellower strain. There are definitely some pure Sativa strains which reliably spike my heart rate and make me crash out.