[ams6110]

http://www.cdc.gov/niosh/ershdb/EmergencyResponseCard_297500...

At one time, nicotine was used in the United States as an insecticide ... Nicotine affects the nervous system and the heart. Exposure to relatively small amounts can rapidly be fatal.

[driverdan]

Like anything the dose makes the poison. The amount of nicotine used in ecigs or tobacco products is well below the amount needed to cause the effects described here.

[goatsecx]

True, you can die from overdosing on carrot juice.

[gwern]

Good thing I'm not an insect and people generally avoid taking anywhere near the LD-50 of 50mg or so (depending on bodyweight & tolerance etc).