If a drop of juice in your mouth is lethal I doubt any of us would be inhaling it into our lungs...lol.
As
@RainSong said, don't go drinking it. You will end up upchucking your lunch. I vape at high wattage (250-350ish on my lipo mods) and I use an RDA and drip and get spit back quite often, especially if the top cap/drip tip isn't very tall (meaning my mouth is closer to the coils) so if I drip a bit too much where the coils are a tad bit too wet I will get spit back. It doesn't hurt you (unless the coils are close to your mouth and you get into higher wattages where the spit back is really hot and if so you will get a few drops of super hot juice hitting your tongue and it will feel like you just had some hot liquid (coffee, hot tea) and burnt your tongue.
Also I don't know if you get heartburn or not but I have acid reflux and I notice that when I get a lot of spit back or I end up licking some just that got on my finger I will get bad heartburn so watch out for that along with the burnt tongue.
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