Can a heavy smoker use e-cigarettes to cut down on smoking?

No.

Electronic cigarettes also have tar. The tar is 30ml, and according to my friends, they basically change it once every 3 days.

Electronic cigarettes also have tar, which is 30ml of tar. In other words, a pack of cigarettes a day,? A pack of cigarettes is 10mg of tar

Electronic cigarettes,? Although there is less nicotine in e-cigarettes, there is a lot of other unknown chemicals in them. But there are a lot of other unknown chemicals in e-cigarettes, and no one can guarantee that there won't be some chronic effects. No one can guarantee that there will not be any chronic problems (the country is expressly prohibited from selling e-cigarettes to sell that are completely harmless to the body and can help to quit smoking to sell the function)

Electronic cigarettes,? will allow you to smoke more frequently (more accustomed to, in fact, is more addictive), because anytime and anywhere you can smoke a little (old smokers understand),? I know people who went from one in 3 days,? to one in two days, which in my understanding is no different from smoking a pack and a half a day

In summary,

1,? The most important thing to remember is that you have to be determined to quit smoking,

2,? The biggest difference between e-cigarettes and traditional cigarettes is that e-cigarettes don't make your mouth water. E-cigarettes don't leave you with a bad taste in your mouth