For anyone who has a strong compulsion to ingest nitrites for whatever in spite of the warnings of this thread, maybe alkyl nitrites (aka poppers) can be used as a harm reduction alternative? Amyl nitrite and isobutyl nitrite are volatile liquids that you can inhale to essentially give yourself a micro dose of SN-like effects. In a lot of countries they are available, though often they are branded as leather cleaner for legal reasons.
Note that drinking them is not advisable. The concentrations are generally not strong enough for severe methemoglobinemia and are not very reliable for a genuine CTB method, though it is likely you will experience strong discomfort and may need medical attention to alleviate the symptoms.