yon the drivers side you can have dark smoke,
what do you class as dark smoke,id say that was 50% which is illegal.
stolen from a 2 second search on google
THE LAW ON TINTED WINDOWS
How dark a car windscreen tint can I have?
There are legal limits specifying how dark tinted windows can be on a vehicle:
behind the B Post (ie rear passenger windows and rear screen) there are no limits
side windows in front of the B Post (ie front passenger windows) must allow 70% of light through
front windscreens must allow 75% of light through
Be careful whether the tint you are considering blocks 70% of light or allows through 70% of light. For front windows the regulations are about the amount of light that is allowed through. Also be aware that if you have a factory tint that blocks 10%, you will only be able to block an additional 20%.
Window tints are not checked on the annual MoT test - the cost of the equipment required at every MoT centre would be excessive. Window and windscreen tints are the responsibility of VOSA. If you are stopped by the police and found to have excessively tinted windows, you will be required to remove the tint. Driving with illegally tinted windows may invalidate your insurance. Limo style all round tints are illegal in the UK.