The smell is caused by the release of a number of chemicals, among which are:-
(Z)-3-hexenal, limonene, hexanal,
(E)-2-hexenal, eugenol,
1,8-cineole, caryophyllene,
beta-phellandrene,
humulene,
and linalool.
They use touch or smell because if they are blind you can smell because coins smell like metal... anyway if touch you can touch stuff by a bit of help of smell. Have a good day :)
· tomato · tongue · touch
Sight, hearing, touch and smell
see hear smell taste touch
there are 5 sight hear touch taste smell
Touch
If you can touch feel smell touch and or hear
It has a sharp sense of touch, smell, and taste.
feel, touch, or exhale.
Your five senses are sight, hearing, touch, smelling and tasting.
In my area we have only red squirrels they don't eat my tomatoes. I don't know about grey squirrels though. Tomato plants are from the nightshade family and are poisonous[apart from the fruit of course]. We have lots of deer around us but they never touch the tomato plants. I'd give them a go if I were you.
A touch-me-not plant is useful for entertainment, as a 'pet' or for illustrating the unusual feature of fast movement in a plant.