一,取决于啥毒品,二,取决于什么叫“交往”。男女朋友最好还是算了。
至于这东西有多严重/无所谓,大家不妨看看这个数据
Drug use among adults (England and Wales)
In 2015/16, around 1 in 12 (8.4 per cent) adults aged 16 to 59 had taken an illicit drug in the last year. This equates to around 2.7 million people.
This level of drug use was similar to the 2014/15 survey (8.6 per cent), but is significantly lower than a decade ago (10.5 per cent in the 2005/06 survey).
Drug use among children (England)
In 2014, 15 per cent of pupils had ever taken drugs, 10 per cent had taken drugs in the last year and 6 per cent had taken drugs in the last month.
The prevalence of drug use increased with age. 6 per cent of 11 year olds said they had tried drugs at least once, compared with 24 per cent of 15 year olds.
http://digital.nhs.uk/catalogue/PUB23442
换句话说,基本上如果家里有小孩的话,想有个完全没有认识的人吸毒/吸过毒的环境真的很不容易。