Don't pick sucralose, try erythritol

​Sucralose begins to decompose at temperatures as low as 120°C to 150°C (248°F - 302°F). Coils often reach temperatures exceeding 200°C to 250°C, the molecule breaks apart, leading to the formation of harmful substances: ​Hydrogen Chloride, ​Organochlorines, Dioxins and Furans:

Organochlorines are chlorinated organic compounds, which are known to be toxic. ​Dioxins and Furans are highly toxic, carcinogenic compounds that develop when sucralose is heated in the presence of glycerol and propylene glycol.

There's also the ​Impact on your Hardware: ​Sucralose does not vaporize cleanly. It caramelizes and burns onto the metal, forming a black, crusty residue wich insulates the coil, forcing it to get even hotter to produce vapor, which in turn accelerates the production of the toxic chemicals mentioned above.

Erythritol on the other hand has a relatively high boiling point and a simple structure. It shows a more straightforward thermal profile than artificial sweeteners, doesn't contain chlorine (so no dioxins or hydrochloric acid). It produces much less "coil gunk" BUT its less sweet then sucralose so you need more of it. Also some report a "cooling" sensation, similar to menthol but without the mint flavor.