Damn you person who told me about this topic!
I wanted to clear up a few things. I use to smoke 2-3 packs a day and quit on accident when I tried vaping over a year ago. That and I have been working on a blog post about this topic for a couple weeks now, so most of this info is fresh in my head.
Vaping is not harmless, but it is the most successful form of harm reduction to smoking there is. According to the Royal College of Physicians it is 95% less harmful than smoking. Also according to a UK study published in the New England Journal of Medicine it is twice as effective as gums, patches, or sprays for helping smokers quit. In addition no one has ever gotten sick or died as a result of normal nicotine vaping, every single case of lung illness was directly linked to black market THC vapes which were cut with vitamin E acetate. Nicotine vaping is not harmless, but is substantially better for you than any form of smoking. This is because it does not contain carcinogens caused by combustion which is how someone would smoke a cigarette. People who say otherwise are one of two things, lying or uninformed.
Now to the 2ml tank and if it will be enough. A 2ml tank is normally the standard for a Mouth To Lung(MTL) tank. Unless you live in the EU and have to deal with TPD restrictions, then 2ml is the max no matter what. A MTL vape is the same action as a cigarette, where you suck it into your mouth, then inhale as if smoking. They use an above ohm coil, which means above 1.0 ohms, and use a much lower wattage. the basic rule is the higher the ohms the lower the wattage. Right now you don't need to understand ohm's law, but down the road if you get deep into vaping you'll want a full understanding of it.
MTL vaping is typically most satisfying to those quitting smoking. MTL tanks also use an e-liquid with a higher nicotine level, normally 18mg free base, or up to 50mg salt nicotine. This is because the vapor production is quite low, and you don't get as much per hit. Do not ever vape a high nicotine level, above 6mg with a sub ohm tank or coil. Sub ohm produces a lot of vapor, and you should not vape higher than 6 at the absolute highest, unless you are 100% sure of what you are doing, getting nicotine sick is not fun from what I hear.
As you vape a higher mg free base nicotine you'll realize it starts to be harsher the longer you vape it. This normally happens After a few months. This is because your body is processing the nicotine, and it is becoming too much for you. This happens naturally and at different rates for everyone. When you notice your juices getting harsher it is time to step down in nicotine from 18 to 16 or 12. This will keep happening until you are done vaping, or until you find a nicotine level you want to stay at. I enjoy being at 1.5mg with sub ohm vaping, and I don't vape with my mtl tanks at all anymore.
You will want to watch some videos, or read up some on your specific device, and general vaping terminology. Most importantly don't listen to people with their head up their asses who are going to tell you vaping is more dangerous than smoking. It simply is not and people have been vaping for over a decade. Over 10 million people in the states vape, and no one has ever gotten sick from it. That isn't even mentioning places like the UK and Canada where the government and doctors actively promote vaping to smokers because they understand it is the best option for people quitting. Also nicotine on it's own is not bad for you, at least no more so than normal every day items like caffeine.
There is a huge community of people who review and vape on youtube. If you go there and type in the device you have, you'll find lots of reviews for it along with how to use it. A lot of it is visual yes, but after you watch enough videos and learn the terminology you'll have a much better understanding. If you want to save the money you can get into DIY juice making, and rebuilding your own coils. I don't build my own coils but I do use an RDA which means I install a wire coil,and only have to change my cotton in it every couple days.
To the person who asked about vapor having a smell. It is different with every flavor. Right now I'm vaping a strawberry cheesecake milk flavor and it doesn't have much room note. However something with watermelon will make your place smell like cotton candy pretty fast. The same for a bakery vape, you're room will smell like the flavor. My favorite room notes come from a good apple vape, it smells like the best apple air freshener you could buy.