[Kindred]

Try this:

pawn Code:

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    switch(dialogid)
    {
        if(response)
        {
            case 1:
            {
                switch(listitem)
                {
                    case 0:
                    {
                        PlayAudioStreamForPlayer(playerid,"http://listen.di.fm/public5/trance.asx",0.0, 0.0, 0.0, 50.0, 0);
                        CreateBox(playerid, "Radio", "~r~Trance music ~w~radio activated!");
                    }
                    case 1:
                    {
                        PlayAudioStreamForPlayer(playerid, "http://listen.di.fm/public5/harddance.asx", 0.0, 0.0, 0.0, 50.0, 0);
                        CreateBox(playerid, "Radio", "~r~hard dance music ~w~radio activated!");
                    }
                    case 2:
                    {
                        PlayAudioStreamForPlayer(playerid, "http://listen.di.fm/public5/dubstep.asx", 0.0, 0.0, 0.0, 50.0, 0);
                        CreateBox(playerid, "Radio", "~r~Dubstep music ~w~radio activated!");
                    }
                    case 3:
                    {
                        PlayAudioStreamForPlayer(playerid, "http://listen.di.fm/public5/djmixes.asx", 0.0, 0.0, 0.0, 50.0, 0);
                        CreateBox(playerid, "Radio", "~r~DJ mixes music ~w~radio activated!");
                    }
                    case 4:
                    {
                        StopAudioStreamForPlayer(playerid);
                        CreateBox(playerid, "Radio", "~r~Radio ~w~have been stopped!");
                    }
                }
            }
            case 2:
            {
                switch(listitem)
                {
                    case 1:
                    {
                        if(GetPlayerMoney(playerid) < 10) return ShowPlayerDialog(playerid,1, DIALOG_STYLE_MSGBOX, "Error", "You dont have enough money to buy Esse Black cigarette!", "Okay", "Close");
                        GivePlayerMoney(playerid, -10);
                        SetPlayerSpecialAction(playerid, SPECIAL_ACTION_SMOKE_CIGGY);
                    }
                    case 2:
                    {
                        if(GetPlayerMoney(playerid) < 10) return ShowPlayerDialog(playerid,1, DIALOG_STYLE_MSGBOX, "Error", "You dont have enough money to buy G1 cigarette!", "Okay", "Close");
                        GivePlayerMoney(playerid, -10);
                        SetPlayerSpecialAction(playerid, SPECIAL_ACTION_SMOKE_CIGGY);
                    }
                    case 3:
                    {
                        if(GetPlayerMoney(playerid) < 5) return ShowPlayerDialog(playerid,1, DIALOG_STYLE_MSGBOX, "Error", "You dont have enough money to buy Macbeth cigarette!", "Okay", "Close");
                        GivePlayerMoney(playerid, -5);
                        SetPlayerSpecialAction(playerid, SPECIAL_ACTION_SMOKE_CIGGY);
                    }
                    case 4:
                    {
                        if(GetPlayerMoney(playerid) < 20) return ShowPlayerDialog(playerid,1, DIALOG_STYLE_MSGBOX, "Error", "You dont have enough money to buy Malboro cigarette!", "Okay", "Close");
                        GivePlayerMoney(playerid, -20);
                        SetPlayerSpecialAction(playerid, SPECIAL_ACTION_SMOKE_CIGGY);
                    }
                    case 5:
                    {
                        if(GetPlayerMoney(playerid) < 50) return ShowPlayerDialog(playerid,1, DIALOG_STYLE_MSGBOX, "Error", "You dont have enough money to buy Winstone Light cigarette!", "Okay", "Close");
                        GivePlayerMoney(playerid, -50);
                        SetPlayerSpecialAction(playerid, SPECIAL_ACTION_SMOKE_CIGGY);
                    }
                    case 6:
                    {
                        if(GetPlayerMoney(playerid) < 200000) return ShowPlayerDialog(playerid,1, DIALOG_STYLE_MSGBOX, "Error", "You dont have enough money to buy Nicotine Sticks!", "Okay", "Close");
                        GivePlayerMoney(playerid, -200000);
                        SetPlayerDrunkLevel(playerid, 0);
                    }
                }
            }
        }
    }
    return 1;
}

If you can't add a simple switch, you shouldn't bother scripting. I understand you're probably a beginner, but this is very, and I mean, very, basic.