Just put a blurb at the beginning. I dont even really get what an mp is, but i know ppl and most will simply read the number of emails about it n balance that with whether they have to care.
Even if they do open it, thats some heavy reading in that letter. I would just put a blurb about how vaping was so integral to u quitting smoking, to get them interested, and then leave the rest at the bottom because most probably wont know about the legislation either so leave it in there so they dont have to search it.
If u dont find time to protect your freedoms, they will b taken away