If you knew anything about assisted suicide, you'd know that it has always been a "legal grey area" in Switzerland. Medication is much more regulated in Europe than in America to the point where you can't buy Cough syrup without multi-doctoral approval.

Assisted suicide is legal by non-enforcement in Switzerland if you can consent and commence the suicide by yourself. In the traditional case this has been via Barbiturate self-intake. In theory, giving someone barbiturates for the purpose of facilitating suicide may be a crime, but it has never been enforced. By criminalizing NOx-assisted suicide, your are effectively criminalizing any chemical assisted suicide.