Can you continue to drink and smoke when you are pregnant?
It is strongly recommended not to drink alcohol (at all) during pregnancy. However, if you are pregnant and you find very difficult to stop drinking, do not drink alcohol at all during the first three months of pregnancy, then limit yourself to 1 or 2 drinks per week.
Drink lots and alcohol regularly during pregnancy can cause permanent problems in the development and brain damage in the fetus. If you are unable to quit smoking and drinking during pregnancy, and want to help (to stop), talk to your midwife or doctor.
If you smoke, know that it is strongly recommended to quit smoking when you are pregnant. Smoking increases the rate of carbon monoxide in your blood, which reduces the amount of oxygen supplied to your fetus. This affects growth and therefore makes it more vulnerable to infections. The accumulation of problems posed by cigarette smoking during pregnancy can lead to premature birth or miscarriage.
After birth, smoking may increase the risk of sudden death syndrome in infants. It is strongly recommended that your partner also stops smoking, and that you avoid smoky atmospheres.

All drugs (such as cannabis and ecstasy) are obviously dangerous when you are pregnant as they enter the circulation of blood in the fetus and in yours. Drugs like cocaine and heroin can lead to addiction problems in babies. Seek help from your midwife or doctor if you feel concerned.
During pregnancy, an employer must by law you reallocate (rearrange your work) if you are working with toxic chemicals or high-risk procedures like X-rays.