noticed his clothing stunk of smoke 

came home disoriented with red eyes

are you certain= 你確認 

marijuana (咩/ra/ron/na) 大麻

amphetamine= 安非他命

he is starting to go now 

always his friends picking him up 

irritable 

would go from angry to happy very suddenly

mood change suddenly

all symptoms of marijuana use 

Candidly talk to him＝ 開心見誠同佢傾過 

the risk of marijuana use was not as serious as smoking 

個人使用大麻係犯法的

全國性醫藥同科學領域先係合法

my son's life will be ruined