This is hard to answer because the UK has gone back and forth classifying marijuana as a class B drug(criminal to use it) and a class C drug(decriminalized). If it is decriminalized, it doesn't make much of a difference. Out of sight, out of mind.
In the UK,
It is illegal to smoke in:
Public transport areas including trains, taxis etc
Public buildings including hospitals and hospital grounds, pubs, lifts etc.
Places of work including offices and office transport.
It is legal to smoke in:
your own car
your own house
outside
However it is illegal to drop your cigaret buts in public places.
i think it is 16.... but you have to be 18 to buy them.
Any age (within limits), 18 to buy them.
16 to smoke 18 to buy
The average age in the US is 13, imagine it's similar in the UK.
Yes - getting lung cancer at an early age.
You may go Trick or Treating at ANY age in the UK - unlike smoking, drinking, driving etc. there is no existing law to provide an age limit.
Every age is affected adversely by smoking.
It really depends on what age you start smoking at. But from just smoking at the age of 10-11, you will be dead by 25.
18 is the legal age for smoking in the state of Indiana
they never did
No age
There is no "safe age". Smoking can negatively affect you and your life at any age.
There was no smoking age restriction in New Jersey in 1980.
Australia did change the legal age for smoking in 2009.