I live in Switzerland. Is it legal for me to buy snus from swedishmatch.ch?

Yes. The sale of oral tobacco (snus) is banned in the Swiss market, but this does not apply to private import for personal use. The Swiss customs authorities have issued guidelines for how much snus a person is allowed to import into Switzerland for personal use. According to these guidelines, you are permitted to purchase up to 1.2 kg every two months.