Let's get the supplier types out of the way first. Wholesale is buying in bulk and having the order sent to you, then breaking the load down and on-selling. On the other hand, drop shipping is about you selling a product up front without paying for it in advance, then paying for it when you get the sale and the supplier sending it direct to your customer.
Some wholesalers have a dropshipping program, but it's important to note that not all of them do.
If you are looking for an e-cigarette wholesaler, here you go:Link hidden: Login to view
This one is based in the UK: Link hidden: Login to view
For a dropshipper, what we have is based in China:Link hidden: Login to view
To find specific products on their sites, I recommend using the search function and also make sure you contact them directly in order to get their true wholesale pricing which is always better than you will see on their site. When doing this, provide them with the quantity you are ideally looking for, where you want them shipped to, and how often you plan on purchasing - this helps gets the best possible price.
All the best!